Saunier Duval THEMA F 23 E Datasheet

Saunier Duval THEMA F 23 E Datasheet
4000124050-2 10.03
Instructions for Use
Installation and Servicing
To b e l e f t w i t h t h e u s e r
Themaclassic
F24E
Fanned Flue Combination Boiler
G.C.No. 47-047-35
Themaclassic
F18E SB
Fanned Flue System Boiler
G.C. No.41-920-35
F24E shown
Hepworth Heating Ltd., Nottingham Road, Belper, Derbyshire. DE56 1JT
Guarantee Registration
Thank you for installing a new Saunier Duval appliance in your home.
Saunier Duval appliances' are manufactured to the very highest standard so we are pleased to offer our customers’ a
Comprehensive Guarantee.
This product is guaranteed for 24 months from the date of installation or 30 months from the date of manufacture,
whichever is the shorter, for parts. In addition this product is guaranteed for 12 months from the date of installation or
18 months from the date of manufacture, whichever is the shorter, for labour.
The second year of the parts guarantee, from the beginning of the 13th month onwards after installation, is conditional
upon the boiler having been serviced by a CORGI registered gas installer, in accordance
with the manufacturer's recommendations. We strongly recommend regular servicing of your gas appliance, but where
the condition is not met, any chargeable spare parts or components issued within the applicable guarantee period still
benefit from a 12 month warranty from the date of issue by the manufacturer.
We recommend you complete and return as soon as possible your guarantee registration return literature, supplied in
the document envelope.
If your guarantee registration return literature is missing you can obtain a copy by telephoning
Saunier Duval Service on 00 44 (0)1773 828100.
RECORD YOUR SAUNIER DUVAL APPLIANCE DIRECT BY CALLING
0208 247 9857
Customer Service:
Saunier Duval GB GREAT BRITAIN:
Tel. 00 44 (0)1773 828100
Fax. 00 44 (0)1773 828070
Hepworth Heating Ltd.,
Nottingham Road, Belper, Derbyshire. DE56 1JT
Saunier Duval IE IRELAND:
Tel. 00 353 (0)14191919
Fax. 00 353 (0)14584806
Hevac,
Muirfield Drive
Naas Road
Dublin 12
Technical Advice Line:
Tel. 00 44 (0)1773 828400
General and Sales enquiries :
Tel. 00 44 (0)1773 824141
Fax. 00 44 (0)1773
820569
(0)
4000124050-2
2
Contents
CONTENTS
INSTRUCTION
FOR USE
INSTALLATION
INSTRUCTIONS
SERVICING
INSTRUCTIONS
DESCRIPTION
SECTION
Important Information
Draining and Filling
Appliance Introduction
Appliance Safety Devices
Maintenance and Servicing
User Controls and Lighting
Analogue Programmer F24E only
Digital Programmer Kit F24E only
PAGE No.
4
5
5
6
6
7
8
8
Technical Data
General Information
Heating System Design
Domestic Hot Water System Design F24E only
Boiler Schematic F24E
Boiler Schematic F18E SB
Boiler Location, flue and ventilation
Fixing Jig
Piping System Installation
Boiler installation
Horizontal Telescopic Top Flue Installation
Horizontal Top Flue Installation
Electrical Connection
Commissioning
Changing Gas Type
Bypass Settings
1
2
3
4
5
5a
6
7
8
9
10
10a
11
12
13
14
11
12
13
15
16
16
17
18
19
20
21
23
25
27
29
29
Routine Cleaning and Inspection
Fault Finding
Wiring Diagram F24E
Wiring Diagram F18E SB
Replacement of Parts
Spare Parts
15
16
17
17
18
19
30
34
40
41
42
52
3
4000124050-2
Important Information
Gas safety (Installation and use) Regulations
Electrical Supply
In your interests and that of gas safety, it is the law that ALL gas
appliances are installed and serviced by a competent person
in accordance with the regulations.
WARNING: This boiler must be earthed.
All system components shall be of an approved type and shall
be connected in accordance with the current issue of BS7671
and any applicable local regulations.
Gas leak or fault
WARNING: If a gas leak or fault exists or is suspected, turn the
boiler off and consult the local gas supply company or your
installation/service company.
External wiring must be correctly earthed, polarised and in
accordance with the relevant standards.
Testing and Certification
In IE this is the current edition of I.S.813 "Domestic gas
installation".
In GB this is BS 6891.
This boiler is tested and certificated for safety and
performance. It is therefore important that no alteration is
made to the boiler, without permission, in writing, from
Hepworth Heating Ltd.
Connection of the boiler and system controls to the mains
supply must be through a common isolator and must be fused
at 3A, maximum. This method of connection must be by a fused
double pole isolating switch, with a minimum contact separation
of 3mm on both poles. The switch should be readily accessible
and preferably adjacent to the appliance. It should supply the
appliance only and be easily identifiable as so doing.
Any alteration not approved by Hepworth Heating Ltd.,
could invalidate the certification, boiler warranty and may
also infringe the current issue of the Statutory
Requirements. The requirements are: The installation of this
boiler must be carried out by a competent person in
accordance with the current rules in force in the countries of
destination at the time of installation, for Ireland, install in
accordance with I.S.813 "Domestic Gas Installation".
Manufacture's instructions supplied must not be taken as
overriding statutory requirements.
Alternatively, an unswitched shuttered socket outlet and 3A
fused 3 pin plug, both to the current issue of BS1363 may be
used provided that they are not used in a room containing a bath
or shower.
Wiring to the boiler must be PVC 85oC insulated cable, not less
than 0.75mm2 (24/0.20mm).
CE Mark
Manual Handling Guidance
This boiler meets the requirements of Statutory Instrument
No. 3083 The boiler (Efficiency) Regulations, and therefore is
deemed to meet the requirements of Directive 92/42/EEC on
the efficiency requirements for new hot water boilers fired
with liquid or gaseous fuels.
During the appliance installation it will be necessary to employ
caution and assistance whilst lifting as the appliance exceeds
the recommended weight for a one man lift.
In certain situations it may be required to use a mechanical
handling aid.
Type test for purposes of Regulation 5 certified by: Notified
body 0049.
Take care to avoid trip hazards, slippery or wet surfaces.
Product/production certified by: Notified body 0049.
Heating System Controls
The CE mark on this appliance shows compliance with:
The heating system must be controlled as described in the
relevant part of the current issue of :
1. Directive 90/396/EEC on the approximation of the laws of
the Member States relating to appliances burning
gaseous fuels.
Building Regulations, approved document L1, and the references:
1) GIL 59, 2000: Central heating system specification (CheSS)
and
2. Directive 73/23/EEC on the harmonization of the Laws of
the Member States relating to the electrical equipment
designed for use within certain voltage limits.
2) GPG 302, 2001: Controls for domestic central heating system
and hot water. BRECSU.
3. Directive 89/336/EEC on the approximation of the Laws of
the Member States relating to electromagnetic compatibility.
3) The domestic heating and hot water guide to the building
regulations 2001.
Control of Substances Hazardous to Health
Thermostatic radiator valves may be installed, however they
must not be fitted in a room where the room thermostat is
located.
The adhesives and sealants used in this appliance are cured
and give no known hazard in this state.
Insulation pads / ceramic fibre
These can cause irritation to skin, eyes and the respiratory
tract.
If you have a history of skin complaint you may be susceptible to irritation. High dust levels are usual only if the material
is broken.
Normal handling should not cause discomfort, but follow
normal good hygiene and wash your hands before eating,
drinking or going to the lavatory.
If you do suffer irritation to the eyes or severe irritation to the
skin seek medical attention.
The insulation is composed of non-combustible material.
Air in the heating system
Persistent air in the heating system may indicate leaks in the
system or corrosion taking place. Call your Installation/Servicing
company.
Protection Against Freezing
The appliance has a built in frost protection programme as long
as the electricity and gas are left switched on.
This device operates the burner and system pump when the
temperature inside the boiler falls below 60C.
Any other exposed areas of the system should be protected by
a separate frost thermostat.
4000124050-2
4
Draining and Filling
9744
Caution: The boiler is installed as part of a sealed system
which must only be drained and filled by a competent person.
If the mains electricity and gas are to be turned off for any long
periods during severe weather, it is recommended that the
whole system, including the boiler, refer to diagram 1, should
be drained to avoid the risk of freezing. Make sure that, if fitted,
the immersion heater in the cylinder is switched off.
If in doubt, consult your servicing company.
BOILER DRAIN
VALVE
F24E Only
• If the boiler loses water: the pressure will be indicated, see
diagram 1 (a) and the boiler ON indicator (b) will flash red
indicating a fault. Fill the system by the filling device (c) at the
bottom of the boiler until the pressure gauge reads 1.0 bar.
(b)
A mains inlet pressure of 2.0 bar is required to reach a fill
pressure of 1.0 bar.
Reset boiler: refer to diagram 2, turn the On/Off switch to (0),
wait for five seconds. Turn the On/Off switch to ( I ) to reset the
appliance.
(a)
3.5
• If the boiler loses water: the pressure will be indicated, see
diagram 1 (a) and the running lamp (b) will flash red indicating
a fault. Fill the system with the external filling device until the
pressure gauge reads 1.0 bar.
3
75
2.5
65
2
55
1.5
45
1
35
0.5
Reset boiler: refer to diagram 2, turn the On/Off switch to (0),
wait for five seconds. Turn the On/Off switch to ( I ) to reset the
appliance.
bar
• Warning: Take care not to overfill the boiler. At a pressure of
2.5 bar or above indicating over pressure, the boiler ON
indicator (b) will flash red indicating a fault. The pressure must
be reduced to 1.0 bar by opening the drain valve, refer to
diagram 1. If the fault continues call the relevant Servicing
(c)
➜
F18E SB Only
Diagram 1
organisation or Saunier Duval Service using the telephone
number on the inside front cover of this literature.
Appliance Introduction
In IE reference should be made to the current edition of I.S.813
"Domestic Gas Installations" and the current ETCI rules.
The F24E and F18E SB boilers are wall mounted modulating
boilers with electronic ignition providing central heating and
hot water.
The central heating and domestic hot water (F24E only)
temperatures are user adjustable.
The boiler is of the II2H3+ category and is for use with natural
Gas (G20) as distributed in the United Kingdom, but can be
converted to use Butane (G30), Propane (G31) with the
appropriate kit.
F24E Only. Domestic hot water demand always has priority
over heating demand.
The boiler is designed for use as part of a sealed water central
heating system with fully pumped circulation. The pump,
expansion vessel and associated safety devices are all fitted
within the boiler.
Thema Classic F24E LPG boilers are factory set for use
on Butane (G30) and Propane (G31) without requirement
for any additional adjustments.
The boiler can be installed against either an external wall or on
an adjacent inside wall, that is, the flue system will pass directly
to the rear or to either side to the terminal fitted on the outside
wall face.
The boiler has a fan assisted balanced flue which both
discharges the products of combustion to and draws the
combustion air from the outside of the room.
This boiler is not suitable for outdoor installation.
These instructions should be carefully followed for the safe and
economical use of your boiler. The 'User Controls and Lighting'
section describes how to safely use the boiler.
This boiler may be installed in any room, although particular
attention is drawn to the installation of a boiler in a room
containing a bath or shower where reference must be made to
the relevant requirements.
Note: The boiler serial number is marked on the data label
attached to the rear of the control box.
Any electrical switch or boiler control utilising mains electricity
should be placed so that it cannot be touched by a person
using the bath or shower.
Accessories
A range of accessories are available.
In GB this is the current I.E.E. WIRING REGULATIONS and
BUILDING REGULATIONS.
For further information contact your supplier.
5
4000124050-2
Appliance Safety Devices
Air flow rate safety device
Frost protection
If the flue is obstructed, the built in safety system will turn the
boiler OFF, the fan will continue to run. The boiler will be ready
to operate when the fault has been cleared.
The appliance has a built in frost protection device that
protects the boiler from freezing. With the gas and electric
supplies ON and irrespective of any room thermostat setting,
the frost protection device will light the boiler when the
temperature of the boiler water falls below 6°C.
Overheating safety
In the event of the boiler overheating the safety devices will
cause a safety shutdown. If this happens, call your Installation/
Servicing company.
When the temperature reaches 16°C, the boiler stops.
Electrical supply failure
Heating safety valve
The boiler will not operate without an electrical supply. Normal
operation of the boiler should resume when the electrical
supply is restored.
CAUTION: A heating safety valve with a discharge pipe is fitted
to this boiler.
Any other exposed areas of the system should be protected by
a separate frost thermostat.
The valve MUST NOT BE TOUCHED except by a competant
person. If the valve discharges at any time, switch the boiler off
and isolate it from the electrical supply. Contact your installation/
service company.
Reset any central heating system controls, to resume normal
operation.
If the boiler does not resume normal operation turn the mains
reset switch off and on. If the boiler does not resume normal
operation it is advisable to consult your installation / servicing
company.
Maintenance and Servicing
Cleaning
Please be advised that the ‘Benchmark’ logbook should be
completed by the engineer on completion of commissioning
and servicing.
WARNING: This appliance contains metal parts (components)
and care should be taken when handling and cleaning with
particular regard to edges of sheet metal parts to avoid any
possibility of personal injury.
The boiler casing can be cleaned with a damp cloth, followed
by a dry cloth to polish.
All CORGI Registered Installers carry a CORGI ID card, and
have a registration number. Both should be recorded in your
benchmark Logbook. You can check your installer is CORGI
registered by calling CORGI direct on: 00 44 (0) 1256 372300.
Do not use abrasive or solvent cleaners.
Spare Parts
Maintenance and Servicing
REMEMBER, When replacing a part on this appliance, use only
spare parts that you can be assured conform to the safety and
performance specification that we require. Do not use
reconditioned or copy parts that have not been clearly authorised
by Hepworth Heating Ltd.
To ensure the continued efficient and safe operation of the
appliance it is recommended that it is checked and serviced as
necessary at regular intervals, but in general once a year should
be enough, refer to guarantee registration on the inside front
cover of this literature.
If a part or advice is required contact the relevant service
organisation or Heatcall using the telephone number on the
inside front cover of this booklet.
If this appliance is installed in a rented property there is a duty
of care imposed on the owner of the property by the current
issue of the Gas Safety (Installation and Use) Regulations,
Section 35.
Please quote the name of the appliance, this infomation will be
on the name badge on the front of the appliance.
Servicing/maintenance should be carried out by a competent
person in accordance with the rules in force in the countries of
destination.
To obtain service, please call the relevant service organisation
or Saunier Duval Service using the telephone number on the
inside front cover of this literature.
4000124050-2
6
Central heating temperature selector
minimum setting (approx. 38˚C) up to
maximum setting (approx. 73°C).
5
11880
User Controls and Lighting
Boiler ON indicator
(fault indicated by
light flashing red)
2
On/Off
switch
4
Pressure gauge (bar)
and temperature
gauge (°C)
6
3
1
Programmer
(F24E Only).
Domestic hot water temperature selector (F24E Only)
minimum setting approx. 38˚C up to maximum setting 60˚C.
The ECO setting is ideally suited for all the requirements of normal family use
(showers, washing up etc.). The maximum setting should be reserved for occasional use
when very hot water is required.
1.
4.
Lighting the boiler :
Make sure that:
• The boiler is connected to the electrical supply.
• The gas service cock is open.
• The room thermostat is calling for heat (if fitted).
• Turn the On/Off switch 1
• The boiler ON indicator 5
to
will illuminate green.
If a fault occurs (indicated by
red flashing light) : 5
Stop the boiler :
• Turn the On/Off switch 1
electrical supply is OFF.
(Heating OFF)
to ON ( I )
5.
2.
Heating temperature adjustment : 2
• Winter: Set the control knob
between 1 and 5 (Heating ON)
• Summer: Set the control knob
• Reset boiler: Turn the On/Off switch to ( 0 ),
wait for five seconds. Turn the On/Off switch to (I)
the boiler is reset. If the fault continues call your
Installation/Servicing company or Saunier Duval
Service using the telephone number on the inside
front cover of this literature.
to OFF ( 0 ) the
3.
Domestic hot water adjustment
(F24E Only) : 3
• Position ( 0 ): Domestic hot water
OFF
• Position ( I ) and ECO: Domestic
hot water between approx. 38˚C
and 50˚C
• ECO: Maximum recommended
for constant use
• Between ECO and maxi:
Occasional use for water above
approx. 50˚C
6.
Pressure gauge: 4
• The boiler pressure gauge will show a reading
between 1.0 and 1.5 bar.
Refer to Section Draining and Filling if required.
Diagram 2
7
4000124050-2
Programmer Instructions for Use
Analogue Programmer (F24E Only)
Part No. A20086. Fitted as standard.
Digital Programmer Kit. (F24E Only)
Part No. A20087. Not fitted as standard.
Setting the time, see diagram 3
• Rotate the dial clockwise, by hand, until the indicator arrow
is pointing to the current time.
Note: The time is set in 24 hour format.
Setting the programme “on and off” times, see diagram 3
• Select the on times by pushing the black tappets to the
outside.
• Select the off times by pushing the black tappets to the
inside.
To override or advance the programmer
The clock has a manual on/off switch which operates as
follows:
Upper position
I
:
Heating on continuously
KEYPAD DESCRIPTION
See diagram 4 for position of keypads as described below,
Time/Automatic Run Mode selection
Prog. Programme selection
Res.* Reset clears all settings
ON/OFF selector in Prog. Mode, Manual Override selector
in Run Mode
±1h* Summer/Winter time setting
h
Sets the Hour (12: - - AM)
m
Sets the Minute (- -: 01 AM)
Day Sets Day(s) for time and programmes
Middle position
Lower position
0
:
Heating on timed
:
Heating off
*Recessed keys; use a pen point to press
11460
To override or advance the programmer
INDICATOR
ARROW
Diagram 4
LCD Display
OFF
TIMES
The LCD incorporates a number of different elements to display
various data and information.
ON TIMES
BLACK TAPPETS
Diagram 3
Programmes
The Digital Programmer will accept up to 20 events
Each event consists of:
1. An ON or OFF command
2. Time of day (Hour and Minute)
3. Single day or multiple days
An event is required for each ON and OFF.
4000124050-2
8
Programmer Instructions for Use
NOTE: MULTIPLE ON OR OFF EVENTS MAY BE
PROGRAMMED, SEE EXAMPLE.
Programming 24 Hour or 7 Day Schedules
It may be helpful to write out the programme schedules before
beginning.
BEFORE PROCEEDING WITH SETTING THE TIME AND
PROGRAMMING THE UNIT, PRESS THE RESET KEY TO
CLEAR ALL DATA FROM THE MEMORY.
THE CURRENT TIME OF DAY AND DAY OF WEEK MUST BE
SET PRIOR TO PROGRAMMING. SEE "SETTING THE TIME"
Selecting AM/PM or 24 Hour Time
Example
After pressing reset, the display may show AM (below). The
numbered day symbols will be flashing on and off.
Event 1: ON at 7:00AM Monday through Saturday
Event 2: OFF at 5:00PM Monday through Friday
If the display does not show AM, it is in 24 hour time. To change
to AM/PM mode, press and hold the h key and press the ±1h
key once. AM will appear in display.
Event 3: OFF at 7:00PM Saturday
Three events need to be entered.
If display is in AM/PM mode and 24 hour time mode is desired,
press and hold the h key, press the ±1h key once.
Press Prog. key only once. Display shows:
Setting the Time
Event 1 (ON at 7:00AM Monday through Saturday)
IF THE h AND m KEYS ARE HELD DOWN LONGER THAN 2
SECONDS, THE NUMBERS WILL ADVANCE RAPIDLY.
Press
key during the following:
Press and hold the
key once. ON symbol
appears
Press h key to 07AM
Press m key once to 00
(If British Summer Time is in effect, press ±1h first)
Press Day key once 1 2 3 4 5 6 is displayed
1. Press h to advance to the current hour
(while holding down the
key)
Press Prog. key to enter
2. Press m to advance to the current minute
(while holding down the
key)
Event 2 (OFF at 5:00PM Monday through Friday)
3. Press Day repeatedly to advance to current day
key)
(while holding down the
Press
Day Key Selections
Press m key once to 00
key twice. OFF symbol
appears
Press h key to 05PM
Press Day Key
Display Shows
Days
Press Day key two times 1 2 3 4 5 is displayed
0 times
1234567
Every Day
Press Prog. key to enter
1 time
123456
Mon.–Sat.
2 times
12345
Mon.–Fri.
Event 3 (OFF at 7:00PM Saturday)
Sat. & Sun.
Press
Monday
Press h key to 07PM
Tuesday
Press m key once to 00
Wed.
Press Day key 9 times until only 6 is displayed
Thursday
Press Prog. key to enter
Friday
Press
Saturday
IF AN "ON" TIME WAS PROGRAMMED THAT IS EARLIER IN
THE DAY THAN THE CURRENT TIME, PRESS ONCE TO
TURN THE TIMER "ON". (IT DOES NOT "LOOK BACK" TO
DETERMINE IF IT SHOULD BE ON OR OFF AFTER
PROGRAMMING).
3 times
4 times
5 times
6 times
7 times
8 times
9 times
10 times
67
1
2
3
4
5
6
7
Sunday
NOTE: If the days are flashing, it indicates the day of the week
was not set when setting the time. The timer cannot be
programmed unless the day of the week is entered.
key twice. OFF symbol
appears
key to enter Run Mode
IF 24 HOUR TIME CONTROL (SAME SCHEDULE EVERY DAY
OF THE WEEK) IS DESIRED, IGNORE Day KEY.
Manual GMT/BST Time Changeover
If an ON or OFF symbol is not entered, the ON symbol will flash,
and programme will not be accepted.
Each year, in the Spring, press ±1h to advance the time an
hour. In the Autumn, press ±1h to set back an hour.
9
4000124050-2
Programmer Instructions for Use
Event Review
Troubleshooting
To review the programs at any time, press Prog. key. Events will
appear in the order they were entered with repeated presses of
the Prog. key. After all events have been reviewed, the blank
display will appear to allow entering another event. Another
press of the Prog. key will display the number of free events
available, such as Fr 16 if 4 events have been entered.
PROBLEM: Days are flashing, pressing any key does nothing
except
SOLUTION: Time of Day and Day of Week have not been set.
See "SETTING THE TIME"
This is the condition after a reset. If the timer is found in this
condition after it has been installed, programmed and operating
for a while, it may indicate that interference has disrupted the
microprocessor causing a loss of programme information.
Manual Override
While in the Run Mode, pressing the
key once will reverse
the current mode; ON to OFF or OFF to ON. The symbol
appears in the display to indicate a temporary override.
At the next scheduled switching time, automatic control
resumes, eliminating the override.
A second, but very unlikely cause of loss of programme is a
power failure with the backup capacitor low or dead. Check by
disconnecting power and monitoring how long the capacitor
keeps the time of day in the display. Typically, the capacitor will
maintain the time and programmes for 4 days, but not more
than 5 days.
CONTINUOUS OPERATION: While in the Run Mode, press
the
key twice to turn the output to permanently ON.
symbol appears in display.
Pressing the
permanently.
PROBLEM: Time of day was set while holding the
down, but days are still flashing.
key three times will turn the output OFF
symbol appears in display.
To terminate a continuous override, press the
appears in the display.
key until
PROBLEM: It is 10AM and an ON event for 8AM was entered,
but the output is not ON. Display shows the
and
symbols.
SOLUTION: After programming, the timer does not "look back"
key (temporary
to determine if it should be ON. Press the
Select the event to be changed with the Prog. key. A new set
of days may be selected with the Day key just as in initial
programming.
override) to turn the output ON;
appears in display.
The timer will assume automatic operation at the next
programmed event.
Hours and minutes can be changed with the h and m keys.
key to store the new programme.
PROBLEM: An event for 8AM Monday through Friday was
entered,
Deleting an Event
but it will not accept it and
To delete only one or a few events: Press Prog. key until the
desired program is displayed.
is flashing.
SOLUTION: The ON
or OFF
was not entered as part
of the program. ON or OFF must be selected.
Press m key to :59 and press once more to blank out.
Press h key to 11PM and press once more to blank out.
key, display will flash for several seconds and then
Press
enter the Run Mode. Using the reset key will delete ALL events,
the time of day, and day of the week.
4000124050-2
key
SOLUTION: Current day of week was not set while holding
the key. See "SETTING THE TIME"
down
Changing an Event
Press Prog. or
key turns output ON and OFF.
10
1 Technical Data
F24E
F18E SB
Heating
Heating
Heat input (max) NET Q
26,94 kW
91,200 BTU/H
Heat input (max) NET Q
Heat input (min) NET Q
9,91 kW
33,820 BTU/H
Heat output (max) NET P
23,6 kW
81,550 BTU/H
Heat output (min) NET P
8,9 kW
30,370 BTU/H
Efficiency - Sedbuk D
78,3%
Maximum heating temperature
87° C
Expansion vessel effective capacity
5 litres
Expansion vessel charge pressure
0,5 bar
Maximum system capacity at 75°C
110 litres
Safety valve,
maximum service pressure 3 bar
Heat input (min) NET Q
11 kW
37,532 BTU/H
Heat output (max) GROSS P
19,8 kW
67,556 BTU/H
Heat output (min) GROSS P
9,2 kW
31389 BTU/H
Efficiency - Sedbuk D
78,8%
Maximum heating temperature
87° C
Expansion vessel effective capacity
5 litres
Expansion vessel charge pressure
0,5 bar
Maximum system capacity at 75°C
110 litres
Safety valve,
maximum service pressure 3 bar
Hot water
Heat input (max) NET Q
26,94 kW
91,200 BTU/H
Heat input (min) NET Q
9,91 kW
33,820 BTU/H
23,6 kW
81,550 BTU/H
8,9 kW
30,370 BTU/H
60 °C
38 °C
9,8 litres/min.
1,7 litres/min.
10 bar
0,5 bar
Heat output (max) NET P
Heat output (min) NET P
Maximum hot water temperature
Minimum hot water temperature
Specific flow rate (for 35°C temp rise)
Threshold flow rate
Maximum supply pressure
Minimum supply pressure
21,9 kW
74,722 BTU/H
Combustion
Products outlet diameter
Fresh air inlet diameter
Combustion products values
60 mm
100 mm
CO (30 ppm)
CO2 (5,9%)
NOx (76 ppm)
Electrical
Electrical supply
Electrical rating
Level of protection
Fuse rating
230 V ~ 50Hz
122 W fused at 3A
IPX4D
1,25mA
Combustion
Products outlet diameter
Fresh air inlet diameter
Combustion products values
60 mm
100 mm
CO (60 ppm)
CO2 (6,7%)
NOx (48ppm)
Natural Gas (G20)
Ø Burner injector
Inlet pressure
Maxi. Burner pressure
Mini. Burner pressure
Gas rate maximum
Electrical
Electrical supply
Electrical rating
Level of protection
Fuse rating
230 V ~ 50Hz
122 W fused at 3A
IPX4D
125mA
Natural Gas (G20)
Ø Burner injector
Inlet pressure
Maxi. Burner pressure
Mini. Burner pressure
Gas rate maximum
Gas rate minimum
Butane Gas (G30)
1,2 mm
20 mbar
12,2 mbar
2,25 mbar
2,74 m3/h
1,16 m3/h
Ø Burner injector
Inlet pressure
Maxi. Burner pressure
Mini. Burner pressure
Gas rate maximum
Gas rate minimum
Butane Gas (G30)
Ø Burner injector
Inlet pressure
Maxi. Burner pressure
Mini. Burner pressure
Gas rate maximum
Gas rate minimum
0,73 mm
29 mbar
23,2 mbar
4,41 mbar
2,01 kg/h
0,87 kg/h
0,73 mm
29 mbar
17,65 mbar
4,41 mbar
1,72 kg/h
0,87 kg/h
Propane Gas (G31)
Ø Burner injector
Inlet pressure
Maxi. Burner pressure
Mini. Burner pressure
Gas rate maximum
Gas rate minimum
Propane Gas (G31)
Ø Burner injector
Inlet pressure
Maxi. Burner pressure
Mini. Burner pressure
Gas rate maximum
Gas rate minimum
1,2 mm
20 mbar
8,82 mbar
2,25 mbar
2,3 m3/h
0,73 mm
37 mbar
29,8 mbar
5,4 mbar
2,01 kg/h
0,83 kg/h
11
0,73 mm
37 mbar
22,52mbar
5,4 mbar
1,70 kg/h
0,83 kg/h
4000124050-2
1 Technical Data
9699
The F24E and F18E SB are delivered in
two separate packages:
• The boiler including hanging bracket
complete with isolating valves and fittings.
• The flue system.
Net lift weight (boiler only)
F24E
34 kg
F18E SB
32 kg
Gross lift weight
(boiler, hanging bracket
isolation valves and packaging)
F24E
35 kg
F18E SB
33 kg
Diagram 1.1
2 General Information
The Water Fittings Regulations or Water Bylaws in Scotland.
The Health and Safety at Work Act, Control of Substances
Hazardous to Health (COSHH).
IMPORTANT NOTICE.
Where no British Standards exists, materials and equipment
should be fit for their purpose and of suitable quality and
workmanship.
The Current I.E.E. Wiring Regulations.
Where no specific instructions are given, reference should be
made to the relevant British Standard Code of Practice.
Refer to Manual Handling Operations, 1992 regulations.
The installation of this boiler must be carried out by a competent
person in accordance with the rules in force in the countries of
destination.
In I.E the installation must be carried out by a competent person
and installed in accordance with the current edition of I.S. 813
Manufacturer’s instructions must not be taken as overriding
statutory requirements.
"Domestic Gas Installations", the current Building Regulations
and reference should be made to the current ETCI rules for
electrical installation.
2.1 Sheet Metal Parts
In GB the following Codes of Practice apply:
WARNING: When installing the appliance, care should be taken
to avoid any possibility of personal injury when handling sheet
metal parts.
BS4814, BS5440 Part 1 and 2, BS5449, BS5546 Part 1, BS6700,
BS6798, BS6891 and BS7074 Part 1 and 2, BS7478, BS7593,
BS7671.
2.2 Statutory Requirements
In IE: I.S.813, BS5546, BS5449, BS7074, BS7593.
The appliance is suitable only for installation in GB and IE and
should be installed in accordance with the rules in force.
Manufacturer’s notes must not be taken as overriding statutory
requirements.
In GB the installation of the boiler MUST be carried out by a
competent person as discribed in the following regulations:
BSI Certification
Manufacturer’s instructions, supplied.
This boiler certificated to the current issue of EN 483 for
performance and safety.
The Gas Safety (Installation and Use) Regulations.
It is important that no alteration is made to the boiler, without
permission, in writing, from Hepworth Heating Ltd.
The appropriate Building Regulations, either The Building
Regulations, The Building Regulations (Scotland), The building
Regulations (Nothern Ireland).
4000124050-2
Any alteration that is not approved by Hepworth Heating Ltd.,
could invalidate the warranty and could also infringe the current
issue of the Statutory Requirements.
12
2 General Information
2.3 Gas Supply
Important Notice
The gas installation must be in accordance with the relevant
standards.
If your boiler has been converted to use L.P.G. Propane the
following note applies:
In GB this is BS 6891.
Propane cylinders are under pressure and should never be
stored or used indoors residentially.
In IE this is the current edition of I.S.813 "Domestic gas
installation".
They should only be kept outside.
Under no circumstances should L.P.G. Propane cylinders be
fitted or stored in basement areas or boiler houses.
The supply from the governed meter must be of adequate size
to provide a steady inlet working pressure of 20mbar (8in wg) at
the boiler.
On completion, test the gas installation for soundness using the
pressure drop method and suitable leak detection fluid, purge in
accordance with the above standard.
Bypass fully shut
2
Open 1/4 turn
3
Open 1/2 turn
4
Open 1 turn
5
Open 2 turns
50
Available pressure (kPa)
1
9700
3 Heating System Design
1
40
2
3
30
4
5
20
10
0
(10 kPa = 1 m WG)
500
Flow rate through heating system (I/h)
1000
Diagram 3.1
The installation of the boiler must comply with the requirements
of the current issue of BS6798, in Ireland, refer also to the
current edition of I.S.813"Domestic Gas Installations".
• The system can be fitted with a lockable control valve if
necessary in the main flow or return pipes shown as valve 'A'
in diagram 3.2.
In GB it is necessary to comply with the Water Supply (Water
Fittings) Regulations 1999 (for Scotland, the Water Byelaws
2000, Scotland).
• The piping system shall be routed so as to avoid any air
pockets and facilitate permanent venting of the installation.
Bleed fittings must be provided at every high point of the
system and on all radiators.
To comply with the Water Regulations your attention is drawn
to: The Water Regulations guide published by the Water
Regulation Advisory Service (WRAS) which gives full details of
the requirements.
• The total volume of water permitted for the heating system
depends, amongst other things, on the static head in the cold
condition. The expansion vessel on the boiler is pressurised at
0.5 bar and allows a maximum system volume of 110 litres for
an average temperature of 75°C and a maximum service
pressure of 3 bar. This pressure setting can be modified at
commissioning stage if the static head differs. An additional
expansion vessel can be fitted to the system if required, see
diagram 3.2.
In IE the requirements given in the current edition of I.S.813
"Domestic Gas Installations" and the current Building
Regulations must be followed.
• The F24E and F18E SB are for use with sealed central heating
systems.
Guidance on vessel sizing is also given in a current issue of a
BS5449 and BS7074 Part 1, for IE refer to the current edition
of I.S.813 "Domestic Gas Installations".
• Heating surfaces may consist of radiators, convectors or fan
assisted convectors.
• The safety valve is an integral part of the boiler and it cannot
be adjusted.
• Provision shall be made for a drain valve at the lowest point
of the system.
• The circulation pump is integral with the boiler.
• Where thermostatic radiator valves are fitted, not all radiators
must be fitted with this type of valve, and in particular, where
a room thermostat is installed.
• Pipe sectional areas shall be determined in accordance with
normal practices, using the output/pressure curve
(diagram 3.1). The distribution system shall be calculated in
accordance with the output requirements of the actual system,
not the maximum output of the boiler. However, provision shall
be made to ensure sufficient flow so that the temperature
difference between the flow and return pipes be less than or
equal to 20°C. The minimum flow rate is shown in table 1.
• In the case of an existing installation, it is ESSENTIAL that the
system is thoroughly flushed prior to installing the new boiler,
using a proprietary product from Fernox or Sentinel.
13
4000124050-2
3 Heating System Design
3.1 Bypass
3.3 Filling the system F18E SB.
• The boiler is fitted with an adjustable automatic bypass.
Ensure that under no circumstances does the flow rate drop
below the figure specified, see table 1.
• Provision for filling the system must be made. The methods
are shown in diagram 3.3. There must be no permanent
connection to the mains water supply, even through a nonreturn valve.
• A system bypass is not required on the central heating circuit
unless the system controls will not ensure aminimum water flow
rate.
NOTE: It is important that fittings used for connection to
potable water comply with the water undertakings requirements.
• Where a bypass has to be fitted, the bypass must be placed
at least 1.5 metres away from the appliance, see diagram 3.2.
TABLE 1. FLOW RATE
Model
F24E
3.2 Filling the system F24E.
• An integral filling device is fitted to the boiler to initially fill the
system and replace water lost during servicing, see the relevant
parts of diagram 2 controls and lighting and diagram 1.
Minimum flow rate
16.94 litres per minute
F18E SB
13.21 litres per minute
Boiler
Filling device
Cold supply in
Hot water out
Domestic
water
SUPPLY
PIPE
9898
Additional
expansion
vessel
(if required)
11593
This is equal to 20°C differential at maximum
heat input.
BOILER
CONTROL
VALVE
FLOW
RETURN
DOUBLE
CHECK
VALVE
HOSE
UNION
Drain
point
Bypass
valve
Control
valve
'A'
*
Flow
Drain
point
HEATING
CIRCUIT
TEMPORARY
CONTROL HOSE CONNECTION
VALVE
UNION
DRAIN
POINT
Return
*
Additional
Bypass valve
(if required)
Method 1
Heating
circuit
Additional
expansion
vessel
(if required)
Boiler
10157
F24E
BOILER
TYPE CA BACKFLOW
PREVENTION DEVICE
FLOW
CONTROL
VALVE
Bypass
valve
*
Additional
Bypass valve
(if required)
HEATING
CIRCUIT
Return
Drain
point
*
'A'
Flow
Control
valve
4000124050-2
CONTROL
VALVE
SUPPLY
PIPE
AIR GAP
DRAIN
POINT
Heating
circuit
F18E SB
RETURN
TUNDISH
Method 2
Diagram 3.2
Diagram 3.3
14
4 Domestic Hot Water System Design. F24E Only
General - All domestic hot water circuits, connections, fittings
must be in accordance with the relevant standards and water
supply regulations.
• The flow restrictor, supplied in the document envelope, must
be fitted as diagram 7.1, limiting the flow through the boiler to
a maximum of 10 litres/min.
For GB: Guidance G17 to G24 and recommendation R17 to
R24 of the Water Regulation Guide.
• The boiler will operate with a minimum supply pressure of 0.5
bar, at a reduced flow rate.
For IE: The current edition of I.S.813 "Domestic Gas
Installations".
Best operating performance will be obtained from a supply
pressure of 1 bar or greater.
• Copper tubing or plastic Hep20 may be used for the domestic
hot water system. Unnecessary pressure losses should be
avoided.
4.1 Hard Water Areas
In areas where the water is 'hard', more than 200mg/litre, it is
recommended that a proprietary scale reducer is fitted in the
cold water supply to the boiler.
• Provision shall be made for a drain valve at the lowest points
of the system.
15
4000124050-2
1 - Fan.
2 - Air pressure switch.
3 - Heat exchanger.
4 - Overheat thermostat.
5 - Combustion chamber.
6 - Expansion vessel.
7 - Flame sense electrode.
8 - Burner.
9 - Ignition electrode.
10 - Pump.
11 - Heating thermistor.
12 - Ignition unit.
13 - By-pass.
14 - Gas control valve.
15 - Loss of water sensor.
16 - Domestic heat exchanger
17 - 3 way valve
18 - Domestic water flow sensor
19 - Filter cold water inlet
20 - Filling system
21 - Discharge safety valve (3bar)
22 - Drain valve
23 - Heating filter
9899
5 Boiler Schematic F24E
FITTED TO
REAR OF
APPLIANCE
A - Heating return
B - Cold water inlet
C - Heating flow
D - Domestic hot water outlet
E - Gas
Diagram 5.1
1 - Fan.
2 - Air pressure switch.
3 - Heat exchanger.
4 - Overheat thermostat.
5 - Combustion chamber.
6 - Expansion vessel.
7 - Flame sense electrode.
8 - Burner.
9 - Ignition electrode.
10 - Pump.
11 - Heating thermistor.
12 - Ignition unit.
13 - By-pass.
14 - Gas control valve.
15 - Loss of water sensor.
16 - Heating filter.
17 - Discharge safety valve (3bar).
11450
5a Boiler Schematic F18E SB
FITTED TO
REAR OF
APPLIANCE
A - Heating return.
B - Heating flow.
C - Gas.
A
B
C
Diagram 5a.1
4000124050-2
16
6 Boiler Location, Flue and Ventilation
6.1 Boiler Location
The recommended clearances are shown in diagram 6.1.
Note: The boiler must be mounted on a flat wall which is
sufficiently robust to take its weight when full. If in doubt, expert
advice should be obtained, in the event of the wall being found
not suitable.
The minimum acceptable spacings from the terminal to
obstructions, other terminals and ventilation openings are
shown in diagram 6.2. For Ireland the minimum distances for
the flue terminal positionning must be those detailed in I.S.813
"Domestic Gas Installations".
11508
The boiler must be installed so that the terminal is exposed to
the external air.
6.2 Terminal guard, see diagram 6.3.
A terminal guard is required if persons could come into contact
with the terminal or the terminal could be subject to damage.
If a terminal guard is required, it must be positioned to provide
a minimum of 50mm clearance from any part of the terminal
and to be central over the terminal.
A suitable terminal guard type K3 can be supplied by:
Tower flue components Ltd.
Morley road
Tonbridge
Kent
TN9 1RA
MINIMUM SITING DIMENSIONS FOR THE
POSITIONING OF FLUE TERMINALS
HORIZONTAL FLUES
A DIRECTLY BELOW, ABOVE OR
HORIZONTALLY TO AN OPENING, AIR BRICK,
OPENING WINDOWS, AIR VENT, OR ANY
OTHER VENTILATION OPENING
300
B BELOW GUTTER, DRAIN/SOIL PIPE
75
C BELOW EAVES
200
D BELOW A BALCONY OR CAR PORT
200
E FROM VERTICAL DRAIN PIPES AND
SOIL PIPES
150
F FROM INTERNAL/EXTERNAL CORNERS
OR TO A BOUNDARY ALONGSIDE THE
TERMINAL
300
G ABOVE ADJACENT GROUND OR
BALCONY LEVEL
300
H FROM SURFACE OR A BOUNDARY
FACING THE TERMINAL
600
I
FACING TERMINALS
1200
J FROM OPENING (DOOR/WINDOW)
IN CAR PORT INTO DWELLING
1200
K VERTICAL FROM A TERMINAL
1500
L HORIZONTALLY FROM A TERMINAL
300
6.3 Flue options
There are various flue systems to choose from as follows:
Horizontal telescopic top flue pack.
Horizontal top flue pack.
Vertical flue pack.
Twin flue pack.
Extensions, 90° and 45° bends.
For detailed information refer to flue options guide. This is
available from your nearest stockist.
6.4 Cupboard or compartment ventilation
The boiler can be fitted in a cupboard or compartment without
the need for permanent ventilation.
11652
25mm
above
elbow
VERTICAL FLUES
M FROM ADJACENT WALL TO FLUE
N FROM ANOTHER TERMINAL
P FROM ADJACENT OPENING WINDOW
Q ABOVE ROOF LEVEL
20mm
5mm
*
300
600
1000
300
Diagram 6.2
600mm
20mm
5mm
*Note: It is permissible to *450mm
install the boiler with smaller
clearances than those quoted
PROVIDING that consideration
is given for Servicing/Repairs.
MM
*
300mm
Diagram 6.1
Diagram 6.3
17
4000124050-2
7 Fixing Jig
The fixing jig is made up as follows:
A - Heating return fitting with isolating valve.
B (F24E Only) - Cold water inlet fitting with isolating
valve (m). The cold water inlet restrictor supplied with
boiler is fitted when the boiler is installed. Refer to
Section 9.
C - Heating flow fitting with isolating valve.
D (F24E Only) - Domestic hot water outlet.
E - Gas service cock.
Other components within the fixing jig pack.
F - Hanging bracket
G - wall template
J - sealing washers and screws
F24E shown
4000124050-2
Diagram 7.1
18
8 Piping System Installation
8.1 Cutting the flue hole
• Remove the wall template, follow the instructions given on the
wall template.
• Position the wall template, taking due regard of the minimum
clearances for the selected flue application, see diagram 8.1.
• Rear hole cutting
• Mark correct position of Top Rear flue outlet hole from
template, then remove template, before cutting, for use, later.
• Side hole cutting
• Mark the horizontal centre line for the hole on the rear wall.
Extend the horizontal centre line to the side wall and mark the
vertical centre line of flue hole as shown in diagram 8.1.
IMPORTANT NOTE: When cutting the flue hole and when
extending the flue centre line to a side wall, remember that the
flue system must have a fall of about 35mm per metre of flue
downward towards the terminal. There MUST never be a
downward incline towards the boiler.
• Making allowance for the slope of the flue, cut hole in external
wall, preferably using a core drill. For installations with internal
and external access use a 105mm diameter core drill.
• For installations with internal access only use a 125 mm
diameter core drill.
8.2 Fixing jig, refer to diagram 7.1
• IMPORTANT NOTE: Ensure that the hanging bracket is fitted
to a flat and true wall area for correct alignment with the boiler.
Side Flue - Check the horizontal centre line and reposition the
template if necessary.
Rear Flue - Reposition the wall template over the hole in wall.
• Mark the securing position holes.
• Check that the hanging bracket is level.
• Drill, plug and secure the bracket to the wall, using suitable
screws (not supplied) for the wall type and capable of supporting
the total weight of the appliance (refer to wall template for fixing
points).
F24E shown
Diagram 8.1
8.3 Water connection
IMPORTANT NOTE: Do not subject the isolating valves to heat
from blowlamp, when making connection.
Connect the system pipework to the fixing jig connection pipes
and the fixing jig isolating valves, observing the correct flow and
return as shown in diagram 8.1.
8.4 Gas connection
Gas Safety (Installation and use) Regulations
In your interests and that of gas safety, it is the law that ALL gas
appliances are installed and serviced by a competent person
in accordance with the above regulations.
• The whole of the gas installation, including the meter, should
be inpected, tested for soundness and purged in accordance
with the current issue of BS6891 and in IE the current edition
of I.S.813 "Domestic Gas Installations".
19
4000124050-2
9 Boiler Installation
• If fitted ensure the plastic plugs are removed from water
and gas pipes. NOTE: There will be some spillage of water.
9.1 Sheet metal parts
WARNING: When installing or servicing this boiler, care should
be taken when handling the edges of sheet metal parts to avoid
the possibility of personal injury.
• (F24E Only) Fit the cold water inlet restrictor (supplied in the
document envelope) into cold water inlet isolating valve, see
diagram 7.1.
9.2 Installing the boiler
Important Note. With regards to the manual handling
operations, 1992 regulations, the following operation exceeds
the recommended weight for one man lift.
IMPORTANT NOTE: The system must be thoroughly flushed
using a propriety cleanser from Fernox or Sentinel to eliminate
any foreign matter and contamination e.g. metal filings, solder
particles, oil, grease etc.
• Lift the boiler up and engage boiler onto the hanging bracket,
refer to diagram 7.1.
Solvent products could cause damage to the system.
• Fit the boiler connection pipes and washers between the boiler
and isolating valves, see diagram 7.1.
• Remove front panel, unscrew and remove the two retaining
screws from the bottom of the front panel. Remove front panel
by lifting up and forward.
9.3 Discharge safety valve (diagram 9.1)
The discharge safety valve pipe and sealing washer supplied
in the connections pack, when fitted to the safety valve, will
extend the valve below the boiler. The discharge pipe must be
extended using pipe not less than 15 mm o.d. to discharge in
a visible position outside the building, facing downward
preferably over a drain.
• To remove the self adhesive wiring diagram label from the
document envelope. Fit the self adhesive wiring diagram label
to the inside of the front panel, put front panel in a safe place
to avoid damaging it.
IMPORTANT NOTE: To facilitate servicing of the appliance,
the discharge pipe MUST ONLY be extended using a
compression fitting supplied.
The pipe must have a continuous fall and be routed to a
position so that any discharge of water, possibly boiling or
steam, cannot create any danger to persons, damage to
property or external electrical components and wiring. Tighten
all pipe connection joints.
9.4 Filling loop extension knob F24E Only
The filling loop extension knob is supplied in the discharge
safety valve pipe connection pack. Fit to the filling device on/
off knob, this is a push fit, see diagram 9.2.
9.5 Filling loop extension knob F18E SB
KNURLED
UNION NUT
finger tighten only
The filling loop extension is not required for this boiler, it can be
discarded.
DISCHARGE
SAFETY VALVE
PIPE
10088
Diagram 9.1
FILLING DEVICE
FILLING LOOP
EXTENSION
F24E Only
4000124050-2
Diagram 9.2
20
The Horizontal Telescopic Top Flue, Kit No.
A2004500
11886
10 Horizontal Telescopic Top Flue Installation
SIDE FLUE
Suitable for installations that require a flue length "L" from 430
minimum to 660 maximum. If longer flueing is required extensions
and bends are available, see note below.
L
If the flue length, see diagram 10.2. is less than 430 'L' Do Not
cut this flue but use the horizontal top flue 86285.
70mm
Note: Additional 1 metre extensions, 90° and 45° bends are
available. The maximum extended flue is 3.5m. The use of flue
bends requires the max extended flue lengths to be reduced by
1m. for 90° and 0.5m. for 45°.
65mm
10.1 Horizontal Telescopic Top Flue
Kit of parts, refer to diagram 10.1.
205mm
10.2 Horizontal telescopic flue system
Rear and side flue lengths and dimensions, see
diagram 10.2.
Note :
Top of boiler
casing not
front panel
410 mm
10322
20mm * refer to diagram 6.1
Min. Clearance
Drill, Screw and
Tape (not supplied)
A
REAR FLUE
J
*
L
E
D
G*
70mm
184mm
H*
F*
65mm
C
B
H
*
Note :
Top of boiler
casing not
front panel
The flue kit A2004500 is 660 mm long and comprises:
- Telescopic flue assembly ..................................... A
- Fixing collar seal ..................................................... B
- Fixing collar ............................................................. C
- Elbow ....................................................................... D
- External rubber sealing collar ............................... E
- *Gasket .................................................................... F
- *Screws 6 off ........................................................... G
- *'O' rings .................................................................. H
- *Screws 4 off ............................................................ J
* supplied in plastic bag
Telescopic Top flue kit
Diagram 10.2
Diagram 10.1
21
4000124050-2
10 Horizontal Telescopic Top Flue Installation
11879
10.3 Installation of telescopic flue assembly
STEP 1.
• For flue lengths up to 0.5m fit the restrictor (supplied in the
document envelope) inside the fan outlet, see diagram 10.3.
FLUE LENGTH
Outside
wall face
• Remove the elbow (D) and the telescopic flue assembly (A)
from the flue kit.
90mm
• Refer to Step 1. diagram 10.4. Fit the telescopic flue
assembly (A) into the prepared hole in the wall. Position the
elbow (D) on the boiler, do not secure. Position the telescopic
flue assembly (A) as it would be fitted.
(D)
(A)
• Refer to Step 2. diagram 10.4. Remove the telescopic flue
assembly (A) from the prepared hole in the wall, make sure the
air duct is extended to its required length. The flue duct at the
elbow end must protrude 25mm. Drill ,secure with two screws
and tape to secure the air duct, take care not to drill the inner
flue pipe. Fit the fixing collar seal (B) to the telescopic flue
assembly (A).
17mm
CL
Flue
centre line
IMPORTANT
"BUTT FIT"
BOILER
• Refer to Step 3. diagram 10.4. Fit the telescopic flue
assembly (A) with the fitted fixing collar seal into the prepared
hole in the wall. Remove the backing from the self adhesive
gasket (F) and carefully fit gasket to base of flue elbow. Fit the
‘O’ rings (H) into the grooves in the flue ducts within the elbow
(D). Lubricate the ‘O’ rings with silicone. Fit flue elbow (D) onto
boiler and secure with the four screws (G).
STEP 2.
(B) FIXING
25mm minimum
Air Duct over lap
• Refer to Step 4. diagram 10.4. Fit rubber sealing collar (E),
into groove at the outer end of the air duct pipe (A). Carefully
pull flue duct pipe into the elbow (D). (If the telescopic flue has
been pulled apart care must be taken not to damage the ‘O’ ring
on the flue duct when re-assembling). Secure with two screws
(G). Pull telescopic flue assembly (A) inwards to bring rubber
sealing collar hard up against external wall.
COLLAR
25mm SEAL
(A)
2 off
• Refer to Step 5. diagram 10.4. Fit the fixing collar (C) using
the two screws (G).
(G) Drill, screw 2 off
and tape the Air Duct
STEP 3.
(D) ELBOW
4 off
(G)
(A)
(E)
EXTERNAL RUBBER
SEALING COLLAR
'O' RING
GASKET
(H)
(F)
BOILER
STEP 4.
11874
(D)
(A)
RESTRICTOR
fitted for flue lengths
less than 0.5m
(E)
(G) 2 off
STEP 5.
(G)
2 off
(D)
(A)
(E)
The restrictor must be fitted
to the inside of the fan outlet.
4000124050-2
FIXING (C)
COLLAR
Diagram 10.3
Diagram 10.4
22
10a Horizontal Top Flue Installation
11886
10a.1 The Horizontal Top flue - kit 86285H
SIDE FLUE
Is suitable for installations that require a max. flue length "L" of
740mm.
If a shorter flue length is required, the flue can be cut to a min.
length"L" of 260mm rear or 300mm side. See diagram 10a.2 for
min. flue lengths.
L
Note: Additional 1 metre extensions, 90° and 45° bends are
available. The maximum extended flue is 3.5m. The use of flue
bends requires the maximum extended flue lengths to be
reduced by 1m. for 90° and 0.5m. for 45°.
70mm
65mm
10a.2 Flue systems rear and side, refer to
diagram 10a.1.
205mm
10a.3 Flue cutting, refer to diagram 10a.2.
Important: Do not leave any burrs or sharp edges on the cut
ends of the pipes.
Note :
Top of boiler
casing not
front panel
410 mm
E
G
B
D
A
20mm * refer to diagram 6.1
Min. Clearance
11646
F
C
J
REAR FLUE
H
I
L
The flue kit 86285 comprises:
- Air duct pipe .......................................................... A
- Flue duct pipe ........................................................ B
- Elbow ....................................................................... C
- Fixing collar seal .................................................... D
- Fixing collar .............................................................. E
- External rubber sealing collar ............................... F
- Internal flange ....................................................... G
- Gasket ..................................................................... H
- Screws ....................................................................... I
- 'O' rings ..................................................................... J
Horizontal Top flue kit
70mm
184mm
65mm
Note :
Top of boiler
casing not
front panel
Diagram 10a.1
Diagram 10a.2
23
4000124050-2
10a.4 Installation of horizontal top flue
assembly
Outside
wall face
Important: If the flue has been cut, ensure that there are no
burrs that could damage the ‘O’ ring.
Flue
centre line
CL
L
• For flue systems less than 0,5 m long, fit the flue restrictor (a)
into the fan outlet, see diagram 10a.4.
11643
10a Horizontal Top Flue Installation
90mm
• Remove the backing from the self adhesive gasket (H) and
carefully fit gasket to base of elbow (C).
• Fit both ‘O’ rings (J) into the flue elbow (C), one at the inlet,
one at the outlet. By necessity, they are a loose fit, apply a small
amount of suitable lubricant to each ‘O’ ring when fitting.
• Fit rubber sealing collar (F), into groove at the outer end of pipe
(A).
17mm
• Insert flue duct pipe (B) into inner end of air duct pipe (A), rotate
flue duct pipe to locate into groove inside air duct pipe.
Air duct cutting length
L minus 90mm
plus 17mm =
cutting length
• Fit air/flue duct pipe assembly through the wall with rubber
sealing collar to the outside.
• Fit internal plastic flange (G) onto air duct pipe (A).
• Fit the fixing collar seal (D) onto the flue duct pipe (B) ensuring
it is the correct way round (the larger diameter onto the pipe).
Flue duct
Air duct
• Pull air/flue duct pipe assembly inwards to bring rubber
sealing collar (F) hard up against external wall.
• Fit elbow onto boiler and secure with the four screws (I).
Carefully push the fixing collar seal onto the elbow ensuring that
the flue duct pipe locates into the flue elbow outlet while taking
care not to tear the ‘O’ ring.
• Fit the fixing collar (E) around the fixing collar seal (D) and
secure with 2 screws provided.
Flue duct cutting length
Air duct cutting length
+ 95mm = cutting length
• Push the internal plastic flange (G) along the air duct pipe (A)
until engaged against internal wall.
25mm
check
dimension
(cut end)
Diagram 10a.3
Horizontal Top flue system
The maximum permissible length (L) is 3.5 m. For flue systems up to 0.5 m length, the flue restrictor must be fitted (a) inside
the fan outlet. For longer flue systems, the restrictor must not be fitted.
For each 90° flue elbow used, (or two 45° elbows) the maximum permissible length (L) must be reduced by 1 metre.
L
Gasket
18
4
65
a
10092
FLUE
RESTRICTOR
Diagram 10a.4
4000124050-2
24
11 Electrical Connection
WARNING: This appliance must be earthed. This appliance
must be wired in accordance with these instructions. Any fault
arising from incorrect wiring cannot be put right under the
terms of the Saunier Duval guarantee.
11.1 Mains Cable
All system components must be of an approved type.
11.2 Voltage Free External Controls
Electrical components have been tested to meet the equivalent
requirements of the BEAB.
Do not interrupt the mains supply with a time switch or
programmer.
WARNING: UNDER NO CIRCUMSTANCES MUST ANY MAINS
VOLTAGE BE APPLIED TO ANY OF THE TERMINALS ON THE
VOLTAGE FREE HEATING CONTROLS CONNECTION
TERMINAL.
Connection of the whole electrical system and any heating
system controls to the electrical supply must be through a
common isolator.
This boiler will operate continuously on heating, as supplied, if
the wire link (E), fitted between the two terminals of the heating
controls connection, is left in place, see diagram 11.1.
Isolation should preferably be by a double pole switched fused
spur box having a minimum contact separation of 3mm on
each pole. The fused spur box should be readily accessible
and preferably adjacent to the boiler. It should be identified as
to its use.
External heating controls e.g. Room thermostat, should be
fitted in accordance with the rules in force and as shown in the
example, diagram 11.2.
Important: If a replacement supply cable is required it must be
purchased. Part No. S1008600.
A fused three pin plug and shuttered socket outlet may be used
instead of a fused spur box provided that:
a) They are not used in a room containing a fixed bath or
shower.
RETAINING SLOTS
11994
11911
b) Both the plug and socket comply with the current issue of
BS1363.
CONTROLS PANEL REAR
COVER
SECURING SCREW (3)
VOLTAGE FREE
HEATING CONTROLS
CONNECTION
TERMINAL
WIRE LINK(E)
Diagram 11.1
Diagram 11.2
25
4000124050-2
11 Electrical Connection
11.3 Mains Voltage External Controls
WARNING: UNDER NO CIRCUMSTANCES MUST ANY
MAINS VOLTAGE BE APPLIED TO ANY OF THE TERMINALS
ON THE VOLTAGE FREE HEATING CONTROLS
CONNECTION TERMINAL.
STRAIN
RELIEF
When mains voltage external controls are used, remove the
MAINS VOLTAGE HEATING CONTROLS CONNECTION PLUG
from the fittings pack and install on the control interface PCB
as follows.
MAINS
CABLE
Gain access to the control interface by unclipping the fascia
panel and hinging forward, see diagram 11.3.
Route the external heating controls cable (not supplied) and
connect to the plug, see diagram 11.3.
EXTERNAL
CONTROLS
CABLE
Insert plug onto controls interface PCB, see diagram 11.3.
Close the fascia panel and remove the screws to open the rear
cover of control panel, see diagram 11.1.
Secure the external heating control cable in the strain relief, and
thread the cable through rear of the control panel and out of the
cables exit, see diagram 11.4.
Diagram 11.4
TO MAIN PCB
CONNECTOR J15
F24E only
IMPORTANT: Remove the wire link from the voltage free
heating controls connector terminal, see diagram 11.1.
11992
Close and secure rear cover of control panel.
CONTROLS
INTERFACE PCB
Connect external heating controls as diagram 11.5.
EXTERNAL
FROST
THERMOSTAT
External controls should be fitted in accordance with the rules
in force.
X
3
2
1
VOLTAGE FREE
HEATING CONTROLS
CONNECTION
(ON CONTROLS
BOX COVER)
DO NOT
CONNECT
MAINS VOLTAGE
HEATING CONTROLS
CONNECTION PLUG
REMOVE LINK
WHEN ANY EXTERNAL
CONTROLS ARE USED
11.4 Electrical Connections - Testing
ON/OFF
SWITCH
Carry out preliminary electrical system checks as below:
PROGRAMMER
1. Test insulation resistance to earth of mains cables.
EXTERNAL
ROOM
THERMOSTAT
2. Test the earth continuity and short circuit of cables.
EXTERNAL
JUNCTION BOX
3. Test the polarity of the mains.
3 AMP FUSE
INTERNAL PROGRAMMER
EXTERNAL 230V AC ROOM THERMOSTAT
L
F18E SB only
N
E
230V~ 50Hz
PERMANENT
MAINS
SUPPLY
EXTERNAL 230V AC FROST THERMOSTAT
TO MAIN PCB
CONNECTOR J15
11993
9762
➜
➜
CONTROL PANEL USER INTERFACE
RETAINING LATCHES
DOUBLE POLE
ISOLATOR
CONTROLS
INTERFACE PCB
EXTERNAL
CONTROLS
CABLE(MAINS
VOLTAGE)
EXTERNAL
ROOM
THERMOSTAT
11974
The type of plug and
orientation may be
different to that
illustrated but the
wiring should always
be as wiring diagrams
EXTERNAL
FROST
THERMOSTAT
X
3
2
1
VOLTAGE FREE
HEATING CONTROLS
CONNECTION
(ON CONTROLS
BOX COVER)
DO NOT
CONNECT
MAINS VOLTAGE
HEATING CONTROLS
CONNECTION PLUG
REMOVE LINK
WHEN ANY EXTERNAL
CONTROLS ARE USED
ON/OFF
SWITCH
EXTERNAL
PROGRAMMER
PLUG
EXTERNAL
JUNCTION BOX
3 AMP FUSE
EXTERNAL PROGRAMMER/CLOCK
EXTERNAL 230V AC ROOM THERMOSTAT
EXTERNAL 230V AC FROST THERMOSTAT
CONTROLS
INTERFACE PCB
Diagram 11.3
4000124050-2
DOUBLE POLE
ISOLATOR
L
N
E
230V~ 50Hz
PERMANENT
MAINS
SUPPLY
Diagram 11.5
26
12 Commissioning
Important: The commissioning and first firing of the boiler
must only be done by a competant person.
Air in pipes
Gas installation
Important: A central heating system can not operate correctly
unless it is filled with water and air bled from the system. If
these conditions are not met the system may be noisy.
If conversion from G20 to 30 or 31 is required, refer to section
13.
It is recommended that any air is purged from the supply at the
gas purge point on the gas valve, see diagram 12.1.
Filling the system
BURNER
PRESSURE
POINT
The following steps 1 - 8, show how to fill the system.
GAS
PURGE
POINT
11898
1.
Make sure that:
9796
Bleed the air in the radiators and adjust the pressure if system
requires. If the system requires filling to often this may be due
to minor leaks or corrosion in the system.
• The boiler is connected to the
electrical supply.
• The gas service cock is open.
Turn the switch OFF ( 0 )
F24E shown
2. • Open the three water isolating valves.
COLD
WATER IN
(F24E Only)
Note: Isolating valves are shown in the: OFF position
HEATING
FLOW
F24E shown
GAS SERVICE
COCK
4. • Turn the switch ON ( I )
• F24E Only Open the tap on the filling device
• Fill the system until the pressure indicated on
the display is 1 bar. Close filling device.
9792
9810
3. • Undo cap on automatic air vent on top of
pump and leave undone.
DOMESTIC HOT
WATER OUT
(F24E Only)
➜
HEATING
RETURN
Diagram 12.1
➜
NOTE: On initial fill there may be a small discharge
of water from the Reduced Pressure Zone valve
27
4000124050-2
6.
• Leave cap open on automatic air vent.
9810
5. • Bleed each radiator to remove air, ensure all
bleed screws are re-tightened.
• If necessary repressurise the system, refer to
procedure 4
Ins 061a
12 Commissioning
➜
8. • Open various hot water taps to bleed system
10217
Ins 062a
7. • Ensure the display indicates a system pressure
of 1.0 bar adjust if necessary.
Adjusting the Central heating output.
The potentiometer P3, is shown in diagram 12.2,to adjust to
the required heating output, insert a small flat edge screw
driver into the arrowed slot in potentiometer P3, turn clockwise
to adjust to the desired setting. Use a manometer to monitor
the burner pressure.
The central heating output is factory preset to approx. 15kW.
If a different central heating output is required, proceed as
follows:
MANOMETER
P.
max.
15 kW
15 kW
maxi
P3
mini
P3
ON
mini
P6
0
1
ON
SW1
DIP
SWITCH
POTENTIOMETER P3
1
P.
max.
maxi
P7
USER
INTERFACE
BOARD
P6
Factory set in
"OFF" position
POTENTIOMETER P6
+
Diagram 12.2
Dip Switches
pump and maximum heating temperature of your boiler.
The position of the SW1Dip Switch(s), see diagram 12.2, and
the table below can be used to change the operation of the
PUMP OPERATION
DIP SWITCH 1
WITH BURNER
ON
WITH HEATING
OFF*
DEMAND
FACTORY SETTING
4000124050-2
* GB/IE PREFFERED SETTING
28
12066
To gain access to potentiometer P3, unclip the control box,
see diagram 11.1.
12 Commissioning
When all adjustments are completed.
• Adjust heating temperature to maximum.
Please ensure the “Benchmark” logbook is completed and left
with the user and the magnetic lighting instruction label is
placed on the surface of the boiler casing.
• Check that any external controls, if fitted, are calling for heat
(set room thermostat to maximum).
Instruct the User
• Allow the temperature to rise to the maximum value, with all
radiator valves open. The temperature rise will cause release of
the air contained in the water of the central heating system.
Instruct and demonstrate the lighting procedure and advise the
user on the safe and efficient operation of the boiler.
Instruct on and demonstrate the operation of any heating
system controls.
• Air driven towards the boiler will be automatically released
through the automatic air vent.
Advise the user on the use and maintenance of any scale
reducer and pass on any relevant instructional documents.
• The air trapped at the highest point of the system must be
released by bleeding the radiators. Check the burner gas rate
required, ten minutes after lighting. Refer to Data Label on
electrical controls box. Should there be any doubt about the
gas rate it should be checked at the meter, refer to technical
data.
Advise that to ensure the continued efficient and safe operation
of the boiler it is recommended that it is checked and serviced
at regular intervals. The frequency of servicing will depend
upon the installation conditions and usage, but in general, once
a year should be enough.
On reaching maximum temperature, the boiler should be
turned off and the system drained as rapidly as possible whilst
still hot.
Draw attention, if applicable, to the current issue of the Gas
Safety (Installation and Use) Regulations, Section 35, which
imposes a duty of care on all persons who let out any property
containing a gas appliance in the UK.
• Refill system to a pressure of between 1 and 2 bar and vent
as before.
It is the Law that any servicing is carried out by a competent
person.
• Restart boiler and operate until a maximum temperature is
reached. If necessary, refer to section 14 to adjust the bypass.
Shut down boiler and vent heating system. If necessary, top up
heating system and make sure that a pressure of at least 1 bar
is indicated when system is COLD.
Advise the user of the precautions necessary to prevent
damage to the system, boiler and the building, in the event of
the heating system being out of use during frost or freezing
conditions.
F24E Only Flush the domestic hot water system by opening the
hot water taps for several minutes.
Completion
Advise the user that the permanent mains electrical supply
SHOULD NOT be switched off, as the built in frost protection
and pump saver program would not be operable.
Adjust the boiler temperature control and any system controls
to their required settings.
Reminder, leave these instructions and the ‘Benchmark’ logbook
with the user.
For IE, it is necessary to complete a "Declaration of Conformity"
to indicate compliance to I.S.813. An example of this is given
in the current edition of I.S.813.
13 Changing Gas Type
Should it be necessary to change the gas type, a conversion kit
with instructions will be required.
• Unclip the control box, see diagram 11.1.
• Run the appliance in heating mode.
This modification must only be carried out by a competent
person.
• Read the burner pressure setting in heating mode, before the
boiler modulates.
Conversion natural gas (G20) to G30/G31 Part No. A20027.
• Adjust the central heating output to the minimum setting by
adjusting potentiometer P3, refer to commissioning section.
Setting the step pressure.
• Adjust the potentiometer P6 burner pressure to the desired
value, by inserting a small flat edge screw driver into the
arrowed slot, turn to adjust to the desired setting, see diagram
12.2.
Adjusting the step pressure may be a necessary operation after
gas conversion or after changing the gas control valve when a
new replacement part is required.
Proceed as follows:
• Return the potentiometer P3 to its initial value.
• Gain access to the gas control valve, connect a pressure
gauge.
Bypass
A
The boiler has a built-in bypass, refer to diagram 14.1.
F24E shown
The boiler is supplied with the bypass open half a turn. It should
not be necessary to adjust the bypass, but if required ensure
that under no circumstances does the flow rate fall below the
figures specified, refer to table 1. in section 3 (turn clockwise
'A' to close the valve ).
9718
14 Bypass Setting
Diagram 14.1
29
4000124050-2
15 Routine Cleaning and Inspection
9532
REMEMBER, when replacing a part on this appliance, use only
spare parts that you can be assured conform to the safety and
performance specification that we require. Do not use
reconditioned or copy parts that have not been clearly authorised
by Hepworth Heating.
PRODUCTS
SAMPLING
POINT
To ensure the continued efficient and safe operation of the
boiler it is recommended that it is checked and serviced at
regular intervals. The frequency of servicing will depend upon
the particular installation conditions and usage, but in general
once a year should be enough.
Diagram 15.1
It is the law that any servicing is carried out by a competant
person.
15.1 Products of combustion check
Note: To obtain a products of combustion reading, unscrew
the left hand sampling point cap on the flue elbow, located on
top of boiler, see diagram 15.1.
15.2 Service Check and Preparation.
Connect the analyser tube onto sampling point.
• Isolate boiler from the gas and electrical supplies.
Refer to the combustion product values in Section 1 Technical
Data.
• (F24E Only) Drain the Domestic hot water circuit, refer to
diagram 15.2.
Switch on the electrical supply and gas supply, then operate
the boiler.
• Drain the boiler, refer to diagram 15.2.
• On completion check all gas-carrying parts for soundness
with leak detection fluid.
On completion of the test switch off the electrical supply and
the gas supply, remove analyser tube and replace sampling
point cap.
To Drain the Domestic hot water circuit (F24E Only)
• Close boiler isolating valve (b).
• Turn on one or more hot water taps.
To Drain the boiler
• Close isolating valves (a) and (c).
• Open the boiler drain valve (f).
(a)
HEATING
RETURN
F24E shown
4000124050-2
(b)
COLD WATER
INLET (F24E Only)
(c)
(f)
HEATING
FLOW
BOILER
DRAIN VALVE
(d)
DOMESTIC HOT
WATER OUTLET
(F24E Only)
Note: Isolating cocks water and gas are shown in the: OFF position
30
(e)
GAS SERVICE
COCK
Diagram 15.2
15 Routine Cleaning and Inspection
15.3 Front panel
9533
• Unscrew and remove the two retaining screws from the
bottom of the front panel.
• Remove front panel by lifting up and forward.
15.4 Control panel
• Lower forwards to gain access to lower part of boiler.
15.5 Sealed chamber cover
• Unscrew and remove the two retaining screws from the
sealed chamber cover, see diagram. 15.3.
• Lift cover up and off pins on top of boiler.
15.6 Side panels (for ease of access if
available), refer to diagram 15.4
• Unscrew and remove the two retaining screws from front of
each side panel.
• Left hand side panel only disconnect the control panel
retaining strap at the control panel.
• Unhook each panel from the front retaining tabs.
• Pull each panel forward from the rear retaining tabs to
remove.
15.7 Combustion chamber cover
• Unscrew and remove the two screws securing combustion
chamber cover to combustion chamber, see diagram 15.5.
Diagram 15.3
• Remove combustion chamber cover from boiler.
15.8 Ignition and Flame Sensing Gaps
9533
• Check that the ignition and flame sensing gaps as shown in
diagram 15.6. Note: To gain access to ignition and sense
electrodes for removal, refer to Section, 18.11 and 18.12 in
Replacement of Parts.
15.9 Burner, refer to diagram 15.7
• Unscrew and remove the two burner retaining screws.
9733
• Remove burner from boiler by easing it forward off the two
burner guides, taking care not to damage the insulation.
• Clean burner by washing in soapy water. Dry thoroughly
before refitting.
Note: To gain access to injectors for removal and cleaning,
refer to Section, 18.8.
15.10 Fan, refer to diagram 15.8
• Disconnect power supply leads and earth lead from fan.
• Unscrew and remove the two fan retaining bolts.
9734
• Ease the fan down and forwards to remove.
31
F24E shown
Diagram 15.4
4000124050-2
15 Routine Cleaning and Inspection
9811
15.11 Heat exchanger, refer to diagram 15.9
• Remove air pressure switch sensing tube from the side of
the flue hood.
• Unscrew and remove the two retaining screws from front of
each side panel.
• Unhook each panel from the front retaining tabs and ease
outwards.
• Remove the flue hood. When refitting ensure the rear of the
flue hood locates in the tabs.
• Use a soft brush or vacuum clean the heat exchanger.
DO NOT USE ANY TOOL LIKELY TO DAMAGE PAINTED
FINISH OF HEAT EXCHANGER.
9741
3.5mm
9752
Diagram 15.5
FAN RETAINING
SCREWS
EARTH
LEAD
3.5mm
IGNITION
GAP
9816
3.5 mm
POWER
SUPPLY
LEADS
Diagram 15.6
9742
BURNER
RETAINING
SCREWS
Diagram 15.8
9818
9812
FLAME
SENSING GAP
AIR PRESSURE
SWITCH
SENSING TUBE
BURNER
GUIDE
9818
9750
9817
FLUE HOOD
HEAT EXCHANGER
Diagram 15.7
4000124050-2
32
Diagram 15.9
15 Routine Cleaning and Inspection
CLIP
DOMESTIC WATER
INLET FILTER
HOUSING
If the water flow rate through the appliance has reduced it may
be necessary to clean or replace the domestic water inlet filter.
9822
15.12 (F24E Only) Domestic water inlet filter,
refer to diagram 15.10
• Close isolating valve (b) on cold water inlet.
• Pull out slotted clip securing the filter in its housing, remove the
filter to clean or renew if necessary.
Push the filter fully into its housing and replace the securing clip.
• Open isolating valve, (b) diagram 15.2, on cold water inlet and
test the Domestic Hot Water circuit for soundness.
15.13 Central Heating Filter, refer to diagram
15.11
Remove the filter retaining clip and filter clean or renew if
necessary.
F24E only
FILTER
Diagram 15.10
Push the filter fully into its housing, ensuring the correct
orientation. The flat and hole in the filter as shown. Secure with
retaining clip.
11934
15.14 Sealed chamber cover seal check
• Check the condition of the seal, replace as required.
• To replace remove the old seal, thoroughly clean the casing
surfaces. Fit new seal, it is supplied to the correct length, see
diagram 18.25.
15.15 Combustion chamber insulation
• Check the condition of the combustion chamber insulation.
If renewing, refer to Section 18.14.
15.16 Flue system
• Check externally to make sure that flue is not blocked
• Inspect flue system to make sure that all fittings are secure.
15.17 Reassembly of parts removed for
servicing
RETAINING
CLIP
FILTER
FLAT
11935
All parts are replaced in reverse order to removal.
F24E shown
33
Diagram 15.11
4000124050-2
16 Fault Finding
Before trying to operate the boiler make sure that :
Overheat thermostat reset button
• All gas supply cocks are open and that the gas supply has
been purged of air.
Refer to Section 18.10 to locate the overheat thermostat
reset button.
• The heating system pressure is at least 1 bar.
Depress the button to reset.
9749
• There is a permanent mains supply to the boiler and that the
polarity is correct.
WARNING. Always isolate the boiler from the electrical supply
before carrying out any electrical replacement work.
OVERHEAT
THERMOSTAT
Always check for gas soundness after any service work.
Should there be any doubt about the voltage supply to any of
the components, it is possible to carry out a simple electrical
test to ensure all is operational in that area.
IMPORTANT: On completion of the fault finding task which has
required the breaking or remaking of the electrical connections,
the continuity, polarity, short circuit and resistance to earth
checks must be repeated using a suitable multimeter.
RESET
BUTTON
Diagram 16.1
4000124050-2
34
16 Fault Finding
TYPE OF FAULT
CHECK
No display on control panel
• 230V supply
• PCB fuse
• Connection between PCBs
No domestic hot water F24E Only)
No central heating
(Red flashing warning light and flashing
fault code in display)
• Loose connections on control board (PCB)
• Connections on air pressure switch (electrical or tubes)
disconnected
• Faulty control or interface board (PCB's)
• Water pressure, flashing pressure
• Shortage of air or gas
• Faulty temperature sensor
• Overheating
COMPONENT TESTING DATA
COMPONENT
NORMAL MEASURE
CHECK
Gas control valve
Resistance of coil 116
Under demand during ignition sparks:
24V dc for 1 to 2 seconds, then
12Vdc (constant) at the gas control
valve electrical connection.
If 0 Volt: the gas control valve
is not faulty.
If 24 Volts and then 12 Volts
but no gas at the burner:
Check if the gas control valve is
stuck. If not, check the
adjustment valve.
Adjustment valve
(step motor)
Close the gas inlet:
Dismantle the step motor (screw not
sealed in). Trigger a demand and check
that the valve opens during the ignition.
If the valve does not move:
Check the connections at both
motor and control board (PCB).
Change the motor. Replace the
control board (PCB).
When heating is on:
230V ac between 1 and 2 of the motor.
About 25V ac to 35V ac between 2 and 3.
When hot water is on:
230V ac between 2 and 3 of the motor.
About 25V ac to 35V ac between 1 and 2.
If voltages are different:
Connections.
Control board (PCB).
Three way valve lead.
3
2
1
Unfasten the clip (YES, no risk of water
leak), pull out the motor and leave it
plugged in.
When hot water is on: the spindle should
pull in. When heating is on : the spindle
should push out.
If electrical supply is OK.
but the motor axle does not move
Replace the motor, or replace
the control board (PCB).
(F24E Only)
Three way valve.
Electrical supply to motor
0 between 1 and 3.
9.6k between 1 and 2.
9.6k between 1 and 3.
(1, 2 and 3 marked on
the motor).
Thrust action of the motor.
(remove gas control valve
before testing)
(F24E Only)
Domestic water flow
To test: Use a new detector and
connect it electrically in place of
the faulty one . Blow through to
simulate a demand for water.
35
4000124050-2
16 Fault Finding
FAULT: NO HEATING
Are the external heating
controls calling for heat?
NO
Rectify fault on external controls.
YES
Rectify, check the 230V
controls board.
NO
Is the polarity correct?
YES
Connect 1 and 2 on J10,
does boiler fire in central heating?
NO
Faulty main PCB.
YES
Faulty 230V controls board.
F24E ONLY
FAULT: NO HOT WATER, BUT THE HEATING IS WORKING
Is the water flow rate greater
NO
than 1.7l/min. (threshold figure).
Check the cold water inlet filter
for dirt. Is the cold water tap fully open ?
Check the heat exchanger for scaling.
YES
Is flow detector operating ?
NO
Change or clean it.
YES
4000124050-2
11800
Check the connectors on the
flow sensor and the control board (PCB).
If the fault persists, fit a relplacement
control board (PCB).
36
16 Fault Finding
F1 FAULT DISPLAYED
FAULT: THE BURNER LIGHTS BUT THEN GOES OUT. THERE IS NO FLAME DETECTED.
The flame is not spreading across
the whole burner and is not reaching
the sensing electrode. Is the gas
pressure correct?
NO
Check that the gas taps are fully open
Check the gas pressure.
NO
Change the gas type for the boiler
(gas conversion kit).
YES
Is the boiler actually designed for the
gas being used.
YES
Clean the gas filter.
Clean the burner.
F1 or F4 FAULT DISPLAYED
FAULT: THE BURNER LIGHTS, THEN GOES OUT.
The flame is spreading across the
whole burner, but not being detected. CHECK
THE
CHECK
PROBE
THE MAINS
FAULT NOT FOUND
11873
If the problem persists, change the
control board (PCB).
(flame detection module faulty).
With the power turned off, check the
continuity between the flame sense
electrode and terminal H2 . 4 on the
control board (PCB). Check the
connector on the end of the wire.
Check that the spark electrode is
pointing towards the flame.
Check the spark electrode. Change it.
37
4000124050-2
16 Fault Finding
F1 FAULT DISPLAYED
FAULT: THE BURNER DOES NOT LIGHT AT ALL, BUT THERE IS AN IGNITION SPARK.
NO
Are the gas taps on?
Turn on the gas taps.
YES
Is there 24Vdc at the gas control valve?
for testing see component testing data.
NO
YES
Check the wiring.
If the problem persists, change the
control board (PCB).
Test the gas control valve.
Check resistance of safety valve coil.
FAULT: THE ROOM TEMPERATURE IS INADEQUATE AND RADIATORS ARE LUKE-WARM.
Is the room thermostat and or radiator
set high enough and calling for duty?
YES
NO
Turn up settings
4000124050-2
Is the heating temperature on the boiler
set high enough?
YES
Is the heating power adequate?
- Check set point P3. (Refer to Commissioning)
- Check dip switch setting. (Refer to Commissioning)
- Check the adjustment of the by-pass internal and
external (If fitted). - F24E Only Check the 3-way valve
is not passing into the domestic hot water heat exchanger.
38
16 Fault Finding
F24E ONLY
FAULT: THE WATER AT THE TAPS IS LUKE-WARM.
Is the temperature higher if you reduce
the flow through the taps?
Check the 3-way valve is not passing
into the radiators. (The radiators should
stay cold in Summer setting)
NO
YES
11875
Check that the cold water inlet restrictor
is fitted.
Check the rate of flow.
Check burner pressure is correct.
FAULT: THE FAN DOES NOT START.
Is there is 230V ac
at fan during demand?
NO
Check continuity of fan harness.
YES
YES
11876
Faulty fan, replace.
Faulty PCB, replace.
FAULT: THE FAN RUNS BUT THERE ARE NO SPARKS.
• CHECK CONTINUITY OF IGNITION (ELECTRODES AND LEADS)
• CHECK POWER SUPPLY FROM PCB TO IGNITION UNIT
CONNECTIONS TO THE AIR PRESSURE SWITCH
Pr
P2
3
P1
2
H
1
L
Electrical contacts.
39
11877
Air flow switch take-off.
4000124050-2
g/y br b
3
1
w
g
IGNITION
PLUG
ELECTRODES
IGNITOR
UNIT
SENSE
ELECTRODE
3
4
w
1
GAS
CONTROL
VALVE
OVERHEAT
THERMOSTAT
or
bk
AIR PRESSURE
SWITCH
FAN
2
PUMP
g/y
w
THERMISTOR
CH
WATER
PRESSURE
SENSOR
b
bk
bk
CHASSIS
EARTH
w p y
g or gn
b
w
g
g
THREE-WAY
VALVE
MAINS VOLTAGE HEATING CONTROLS PLUG
p
w
230V SWITCHED LIVE FROM OPTIONAL FROST STAT.
230V SWITCHED LIVE FROM HEATING CONTROLS.
REMOVE VOLTAGE FREE LINK
CONTROLS
INTERFACE
FLOW
SENSOR
VOLTAGE FREE
HEATING CONTROLS
PLUG
LINK
w
y
REMOVE THE LINK IF FITTING
VOLTAGE FREE OR 230V
EXTERNAL CONTROLS.
IF THE LINK IS NOT REMOVED
THE BOILER WILL RUN
CONTINUOUSLY.
b
r
gn
PROGRAMMER
J10
J15
J11
J13
g/y
H2
J1
S1
br
H5
J12
b
g/y
br
H1
H4
J4
b
b
br
g/y
b
br
H3
CHASSIS
EARTH
H8
J2
br
FUSE
125mAT
J7
H6
b
H7
g/y
w
KEY
bk- BLACK
w- WHITE
g/y- GREEN/
YELLOW
br bpg-
BROWN
BLUE
PINK
GREY
USER INTERFACE
4000124050-2
40
rorgny-
RED
ORANGE
GREEN
YELLOW
r
g/y
b
br
ON/OFF
SWITCH
230V~50Hz
PERMANENT
MAINS SUPPLY
FUSED AT 3A
10224
17 Wiring Diagram F24E
AIR PRESSURE
SWITCH
FAN
g/y br b
bk
IGNITION
ELECTRODES
SENSE
ELECTRODE
3
1
PLUG
3
w
g
or
w
4
w
OVERHEAT
THERMOSTAT
2
PUMP CH
bk
THERMISTOR
CH
b
1
g/y
bk
WATER
PRESSURE
SENSOR
IGNITOR
UNIT
GAS
CONTROL
VALVE
CHASSIS
EARTH
w p y
g or gn
b
w
g
MAINS VOLTAGE HEATING CONTROLS PLUG
230V SWITCHED LIVE FROM OPTIONAL FROST STAT.
230V SWITCHED LIVE FROM HEATING CONTROLS.
REMOVE VOLTAGE FREE LINK
CONTROLS
INTERFACE
VOLTAGE FREE
HEATING CONTROLS
PLUG
LINK
REMOVE THE LINK IF FITTING
VOLTAGE FREE OR 230V
EXTERNAL CONTROLS.
IF THE LINK IS NOT REMOVED
THE BOILER WILL RUN
CONTINUOUSLY.
J10
J15
J13
J11
g/y
H2
J1
S1
br
b
H5
J12
b
br
g/y
H1
H4
J4
NOT
USED
b
br
H3
CHASSIS
EARTH
H8
J2
br
FUSE
125mAT
J7
H6
b
H7
g/y
w
KEY
bk- BLACK
w- WHITE
g/y- GREEN/
YELLOW
br bpg-
BROWN
BLUE
PINK
GREY
USER INTERFACE
41
rorgny-
RED
ORANGE
GREEN
YELLOW
r
g/y
b
br
ON/OFF
SWITCH
230V~50Hz
PERMANENT
MAINS SUPPLY
FUSED AT 3A
4000124050-2
10298
17a Wiring Diagram F18E SB
18 Replacement of Parts
To Drain the central heating circuit
• Open drain valve fitted at the lowest point in the system.
• Allow air into the system by opening a radiator bleed screw or the boilers drain valve (f).
To Drain the Domestic hot water circuit (F24E Only)
• Close boiler isolating valve (b).
• Turn on one or more hot water taps.
To Drain the boiler
• Close the isolating valves (a), (b) and (c) .
• Open the boiler drain valve (f).
(a)
(b)
HEATING COLD WATER
RETURN INLET (F24E Only)
F24E shown
(c)
(f)
HEATING
FLOW
BOILER
DRAIN VALVE
(d)
DOMESTIC HOT
WATER OUTLET
(F24E Only)
(e)
GAS SERVICE
COCK
Note: Isolating cocks water and gas are shown in the: OFF position
Diagram 18.1
IMPORTANT INFORMATION
CENTRAL HEATING
THERMISTOR
F24E shown
9550
WARNING: Before commencing the replacement of any
component, isolate appliance from electrical supply and turn
off gas at service cock.
Replacement of parts must be carried out by a competent
person.
When replacing components it may be necessary to renew
sealing washers, gaskets and 'O' rings. If new ones are
supplied with replacement components they must be used.
All parts are replaced in reverse order to removal.
If any gas-carrying components are disturbed, removed or
replaced it will be necessary on completion of assembly to test
for gas soundness and purge in accordance with the current
issue of BS6891 or in IE, the current edition of I.S.813 "Domestic
Gas Installations".
Diagram 18.2
18.1 Central heating thermistor
• Locate central heating thermistor on heating flow pipe on
centre of boiler, see diagram 18.2.
Before starting refer to the front of Section 18 Important
information.
• Unclip thermistor from pipe.
• Disconnect electrical connections from thermistor.
• Remove the front panel, refer to Section 15.3.
• Fit electrical connections to replacement thermistor and fit
thermistor to pipe. The polarity is not important.
• Lower the control panel, refer to Section 15.4.
4000124050-2
42
18 Replacement of Parts
9646
18.2 Fan.
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
RETAINING
CLIPS
• Remove the sealed chamber cover, refer to Section 15.5.
AIR PRESSURE
SWITCH
• Remove the fan, refer to Section 15.10.
ELECTRICAL
CONNECTORS
18.3 Air pressure switch
Before starting refer to the front of Section 18 Important
information.
SENSING
TUBE
• Remove the front panel, refer to Section 15.3.
• Remove the sealed chamber cover, refer to Section 15.5.
• Locate air pressure switch situated at the top right hand side,
see diagram 18.3.
• Remove air pressure switch tube.
Diagram 18.3
Note: Do not fit tube until the air pressure switch is in position.
• Disconnect air pressure switch electrical connections.
COLD WATER INLET
RESTRICTOR
• Unclip to remove air pressure switch.
18.4 (F24E Only) Domestic water inlet filter
If the water flow rate through the appliance has reduced it may
be necessary to clean or replace the water inlet filter, refer to
section 15.12.
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
COLD WATER IN
ISOLATING VALVE
• Clean or replace the water inlet filter, refer to Section 15.12.
18.5 Central Heating Filter
It may be necessary to clean or replace the central heating filter.
F24E Only
Diagram 18.4
Before starting refer to the front of Section 18 Important
information.
• Isolate flow and return valves (a) and (c).
• Lower the control panel, refer to Section 15.4.
• Clean or replace the central heating filter, refer to Section
15.13.
• Remove the sealed chamber cover, refer to Section 15.5.
• Remove the combustion chamber cover, refer to Section
15.7.
18.6 ( F24E Only) Cold water inlet restrictor
• Remove burner from boiler, refer to Section 15.9.
Before starting refer to the front of Section 18 Important
information.
18.8 Burner injectors, refer to diagram 18.5.
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
Before starting refer to the front of Section 18 Important
information.
• Isolate cold water inlet valve (b).
• Remove the front panel, refer to Section 15.3.
Drain down domestic hot water circuit of boiler only, refer to
relevant part of diagram 18.1.
• Lower the control panel, refer to Section 15.4.
• Remove the sealed chamber cover, refer to Section 15.5.
• Undo union nuts from boiler cold water in isolating valve.
• Remove the combustion chamber cover, refer to Section
15.7.
• Clean and inspect restrictor, replace if necessary, see diagram
18.4.
• Remove burner from boiler, refer to Section 15.9.
18.7 Burner, refer to Section 15.9.
• Remove and replace injectors as required.
Before starting refer to the front of Section 18 Important
information.
Note: The injectors may be cleaned, remove injectors inspect
and clean. Do not use a wire or sharp implement.
• Remove the front panel, refer to Section 15.3.
Note: Make sure that injector size, marked on each injector, is
the same as that given in ‘Section 1 Technical Data’ for the
type of gas being used.
43
4000124050-2
18.9 Burner injector assembly, refer to diagram
18.6.
9819a
18 Replacement of Parts
BURNER INJECTOR
BAR
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
• Remove the sealed chamber cover, refer to Section 15.5.
Diagram 18.5
• Remove the combustion chamber cover, refer to Section
15.7.
GROMMET
• Remove burner from boiler, refer to Section 15.9.
9820
GAS SUPPLY
PIPE
• Undo the gas supply union nut from under the sealed chamber.
Note: The fibre washer between the burner injector assembly
and gas supply must be kept for use on reassembly.
IGNITION ELECTRODE
ASSEMBLY
• Undo and remove the sense and ignition electrode assemblies.
9813
• Remove the burner injector assembly by lifting up, easing the
gas connection through the grommet in the sealing chamber.
9813
SENSE ELECTRODE
ASSEMBLY
• Remove the burner injector assembly securing screws.
Note: Take care not to damage the insulation.
• When refitting burner injector assembly ensure the gas
connection locates correctly through the grommet.
Note: Make sure that injector size, marked on each injector, is
the same as that given in ‘Section 1 Technical Data’ for the type
of gas being used.
18.10 Overheat thermostat
CLIP
Before starting refer to the front of Section 18 Important
information.
9749
Diagram 18.6
PIPE
SECURING
CLIP 2 OFF
• Remove the front panel, refer to Section 15.3.
• Remove the sealed chamber cover, refer to Section 15.5.
OVERHEAT
THERMOSTAT
RESET
BUTTON
ELECTRICAL
LEADS
• Locate overheat thermostat on heating flow pipe on right hand
side of boiler, see part of diagram 18.7.
9750
• Disconnect electrical connections from thermostat
• Remove the thermostat and bracket assembly from heating
flow pipe by unclipping at the side of the bracket. Remove the
thermostat, fit new thermostat and replace assembly.
• When refitting electrical connections to replacement thermostat
the polarity is not important.
18.11 Ignition electrode
HEAT EXCHANGER
Before starting refer to the front of Section 18 Important
information.
Diagram 18.7
18.12 Flame sense electrode
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
Before starting refer to the front of Section 18 Important
information.
• Remove the sealed chamber cover, refer to Section 15.5.
• Remove the front panel, refer to Section 15.3.
• Remove the combustion chamber cover, refer to Section
15.7.
• Lower the control panel, refer to Section 15.4.
• Remove the sealed chamber cover, refer to Section 15.5.
• Remove burner from boiler, refer to Section 15.9.
• Remove the combustion chamber cover, refer to Section 15.7.
• Remove the left hand side panel, refer to Section 15.6.
• Remove burner, refer to Section 15.9.
• Undo and remove screw securing electrode assembly to the
burner injector assembly, see diagram 18.6.
• Remove the right hand side panel, refer to Section 15.6.
• Undo and remove screw securing sense assembly to the
burner injector assembly, see diagram 18.6.
• Disconnect the electrical connections at the ignition unit, see
diagram 18.22. Note the routing of the cables.
• Disconnect the electrical connection from the inline connector,
Note the routing of the cable.
4000124050-2
44
18 Replacement of Parts
18.13 Heat exchanger, refer to diagram 18.7.
18.15 Printed circuit board (PCB), refer to
diagram 18.9.
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
Before starting refer to the front of Section 18 Important
information.
• Remove the sealed chamber cover, refer to Section 15.5.
• Remove the front panel, refer to Section 15.3.
• Remove the combustion chamber cover, refer to Section
15.7.
• Lower the control panel, refer to Section 15.4.
• Drain down central heating water circuit of the boiler only,
refer to relevant part of diagram 18.1.
• Hinge up the control panel cover and ease forwards from the
rear retaining lugs to gain access to PCB. Do not strain the
cables attached to the PCB. Note the routing of the cables.
• Undo and remove the two front retaining screws.
• Remove the fan, refer to Section 15.10.
• Remove air pressure switch sensing tube from the side of the
flue hood, see diagram 15.9.
• Carefully pull off electrical connections to PCB.
• Release both side panels, refer to section 15.6.
• Fit replacement PCB. Be careful not trap any of the cables.
• Remove the flue hood, lift up and off. When refitting ensure
the rear of the flue hood locates in the tabs.
Make sure that PCB connections are fully pushed onto
replacement PCB.
• Unclip and lift out PCB.
• Disconnect the electrical leads from the overheat thermostat.
• Lift to remove the heat exchanger taking, care not to damage
the insulation.
9824a
• Remove the two pipe securing clips.
INSULATION
18.14 Combustion chamber insulation, refer to
diagram 18.8.
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Remove the sealed chamber cover, refer to Section 15.5.
• Remove the combustion chamber cover, refer to Section
15.7.
• Remove the heat exchanger, refer to Section 18.13.
• Pull out side insulation panels from combustion chamber.
• Tilt rear insulation panel forwards and out.
• Fit replacement insulation.
Diagram 18.8
10021
10001
PCB (CONTROL BOARD)
F24E shown
45
➜
➜
CONTROL
BOARD
COVER
Diagram 18.9
4000124050-2
18 Replacement of Parts
230V CONTROLS
BOARD
➜
MAINS
SWITCH
PROGRAMMER
9757
18.16 User interface board, refer to diagram
18.10.
10019
➜
USER INTERFACE
BOARD
➜
9762
➜
➜
➜
CONTROL PANEL
F24E shown
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
Diagram 18.10
HEX HEAD
SCREW
(4 OFF)
PUMP HEAD
• Unclip control panel user interface and hinge forward . Do not
strain the cables.
• Disconnect the electrical connections from the user inter face
board.
PUMP
ELECTRICAL
CONNECTION
BOX
• Remove the two user inter face board retaining screws.
• Remove the user inter face board.
18.17 Mains switch, refer to diagram 18.10.
F24E shown
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
Diagram 18.11
• Unclip control panel user interface and hinge forward. Do not
strain the cables.
• Unclip control panel user interface and hinge forward . Do not
strain the cables.
• Disconnect the electrical connection from the programmer.
• Disconnect the electrical connections from mains switch.
• Undo the two securing screws and remove the programmer.
• Remove the mains switch.
18.20 Central heating pump head, refer to
diagram 18.11.
18.18 230V Controls board, refer to diagram
18.10.
Before starting refer to the front of Section 18 Important
information.
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
• Unclip control panel user interface and hinge forward . Do not
strain the cables.
• Drain down central heating water circuit of the boiler only,
refer to relevant part of diagram 18.1.
• Disconnect the electrical connection from the 230V controls
board and the electrical connection from printed circuit board
(PCB).
Note: it is not necessary to drain down the entire heating
system to carry out this work.
• Remove the 230V controls board retaining screw.
• For ease of access if required remove the right hand side
panel, refer to Section 15.6.
• Remove the 230V controls board.
• Undo four head fixing screws and remove pump head.
18.19 (F24E Only) Analogue programmer, refer
to diagram 18.10
• Gain access to the pump electrical connection box and
remove cover.
Before starting refer to the front of Section 18 Important
information.
• Disconnect pump cable from pump (avoid straining cables).
• Remove the front panel, refer to Section 15.3.
• Fit replacement pump head.
4000124050-2
• Connect electrical connection to replacement pump head.
46
➜
Before starting refer to the front of Section 18 Important
information.
➜
➜
18.21 (F24E Only) Filling system tap, refer to
diagram 18.12.
9765
18 Replacement of Parts
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
• Drain down the hotwater circuit, refer to relevant part of
diagram 18.1.
• Pull of the filling loop tap extension.
• Pull out slotted metal clip securing tap into housing, remove
tap.
➜
18.22 (F24E Only) Reduced pressure zone
valve (RPZ), refer to diagram 18.12.
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
➜
• Pull out slotted metal clip and remove pipe from tap.
WATER FLOW
SENSOR
Diagram 18.14
F24E only
• Lower the control panel, refer to Section 15.4.
• Drain down the boiler only, refer to relevant part of diagram
18.1.
SYSTEM WATER PRESSURE
SENSOR
BYPASS VALVE
9758
• Pull out slotted metal clip securing pipe to RPZ.
• Pull out slotted metal clip securing RPZ into housing, remove
RPZ.
➜
18.23 Boiler drain point, refer to diagram
18.13.
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
➜
• Lower the control panel, refer to Section 15.4.
• Drain down the boiler only, refer to relevant part of diagram
18.1.
Pull out slotted metal clip securing boiler drain valve into
housing, remove boiler drain valve.
F24E shown
Before starting refer to the front of Section 18 Important
information.
CAP
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
Diagram 18.15
9760
18.24 (F24E Only) Water flow sensor, refer to
diagram 18.14.
AIR
VENT
Drain down the hotwater circuit, refer to relevant part of
Section 18.1.
• Undo the union nut on the cold water inlet isolating valve.
• Pull out slotted metal clip securing filling system tap into
housing, swing the tap forwards.
• Pull out the two slotted metal clips retaining the domestic
water inlet filter housing.
F24E shown
Diagram 18.16
• Remove domestic water inlet filter housing.
• Remove electrical connections from water flow sensor.
• Pull off slotted metal clip and remove water flow sensor.
47
4000124050-2
18 Replacement of Parts
GAS CONTROL
VALVE
9781
11591
18.25 System water pressure sensor, refer to
diagram 18.15.
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
➜
Drain down the boiler, refer to relevant part of Section 18.1.
• Remove electrical connections from water pressure sensor.
• Pull off slotted metal clip and remove water pressure sensor.
18.26 Bypass valve, refer to diagram 14.1.
Before starting refer to the front of Section 18 Important
information.
9782
➜
➜
Please ensure that the new "O" ring and clip supplied are fitted.
➜
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
Drain down the boiler, refer to relevant part of Section 18.1.
• Remove the ignition unit, refer to Section 18.33.
F24E shown
Diagram 18.17
10018
Pull out slotted metal clip, ease out bypass valve from bypass
valve housing.
18.27 Automatic air vent, refer to diagram
18.16.
Before starting refer to the front of Section 18 Important
information.
GAS CONTROL
VALVE
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
➜
• Drain down the boiler only, refer to relevant part of diagram
18.1.
• Unscrew to remove automatic air vent.
STEPPER
MOTOR
➜
• After fitting replacement automatic air vent ensure the cap is
open.
➜
18.28 Gas Control valve, refer to diagram
18.17.
Before starting refer to the front of Section 18 Important
information.
Diagram 18.18
• Remove the front panel, refer to Section 15.3.
11585
• Lower the control panel, refer to Section 15.4.
• Disconnect gas supply pipes union nuts at the gas control
valve.
• Disconnect supply pipe union nut at the burner injector bar.
➜
• Remove the locking nut and brass washer from underside of
gas control valve.
PRESSURE
RELIEF
VALVE
• Ease gas control valve forwards and disconnect electrical
connections to gas control valve.
• Withdraw gas control valve assembly.
➜
Note: Use the new washers supplied with the gas control valve.
• Fit gas valve restrictor to replacement gas control value.
• Fit replacement gas control valve.
F24E shown
Check the Min. gas pressure and if it requires adjusting, refer
to Section 13 Changing Gas Type.
4000124050-2
48
Diagram 18.19
18 Replacement of Parts
9768
18.29 Gas control valve stepper motor, refer to
diagram 18.18
Before starting refer to the front of Section 18 Important
information.
➜
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
• Remove the gas control valve, refer to Section 18.28.
• Disconnect the electrical connection from stepper motor.
• Remove the two screws securing stepper motor to the gas
control valve.
THREE WAY
VALVE HEAD
• Fit replacement gas control valve stepper motor.
• Note: Take care not to damage the 'O' ring.
9769
18.30 Discharge safety valve, refer to diagram
18.19.
➜
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
• Undo discharge pipe union nut.
• Pull out slotted metal clip from valve body and remove valve.
18.31 (F24E Only) Three-way valve head, refer
to diagram 18.20.
F24E only
Diagram 18.20
10017
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
THREE WAY
VALVE/ BYPASS
HOUSING
• Lower the control panel, refer to Section 15.4.
9785
• Remove gas control valve, refer to Section 18.28. (It will not
be necessary to remove the gas control electrical cables).
• Remove electrical plug from valve head.
• Pull out slotted metal clip from valve body and remove valve
head from body.
• Fit replacement valve head.
THREE WAY
VALVE
ACTUATOR
➜
Note :
1) When refitting clip, ensure that letters YES are as shown.
2) It is not necessary to drain boiler to carry out this work.
Diagram 18.21
➜
➜
➜
9767
F24E only
IGNITION
UNIT
➜
Diagram 18.22
49
4000124050-2
18 Replacement of Parts
Before starting refer to the front of Section 18 Important
information.
➜
• Remove the front panel, refer to Section 15.3.
➜
11596
18.32 (F24E Only) Three-way valve actuator,
refer to diagram 18.21.
• Lower the control panel, refer to Section 15.4.
• Drain down the boiler only, refer to relevant part of diagram
18.1.
• Remove the gas control valve, refer to Section 18.28.
• Remove 3-way valve head, refer to Section 18.31.
• Remove the three way valve actuator.
9775
DOMESTIC HOT WATER PLATE TO
PLATE HEAT EXCHANGER
18.33 Ignition unit, refer to diagram 18.22.
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
➜
• Disconnect electrical connections.
➜
• For ease of access remove the left hand side panel, refer to
Section 15.6.
• Remove ignition unit securing screw.
• Pull upwards to release and remove the ignition unit from the
retaining slot.
18.34 (F24E Only) Domestic hot water plate to
plate heat exchanger
F24E only
Diagram 18.23
9773
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
9771
Before starting refer to the front of Section 18 Important
information.
• Drain down the boiler and hotwater circuit ,refer to relevant
parts of diagram 18.1.
• Unclip the central heating thermistor.
• Unscrew the heating flow pipe union nut, swing pipe forwards.
• Remove the gas supply pipe between the gas control valve
and injector bar, see diagram 18.23.
• Supporting domestic hot water plate to plate heat exchanger,
unscrew and remove two screws securing it onto pump
mounting and 3-way valve/bypass housing.
• Remove plate to plate heat exchanger from boiler.
EXPANSION VESSEL
• Fit replacement plate to plate heat exchanger.
9772
➜
• Disconnect the union connection from the expansion vessel.
Note: Plate to plate heat exchanger mounting screws are offset
to ensure correct fitting.
F24E shown
4000124050-2
50
Diagram 18.24
18 Replacement of Parts
9873
Renewal of the expansion vessel requires the boiler to be
removed from the wall. As an alternative, a separate expansion
vessel of the same specification may be connected as close as
possible to the boiler, leaving the original in position, refer to the
installation instructions.
9872
18.35 Expansion vessel
Replacing the expansion vessel
Before starting refer to the front of Section 18 Important
information.
• For this operation the boiler must be removed from the wall.
➜
• IMPORTANT: With regards to the manual handling operations,
1992 regulations, the following operation exceeds the
recommended weight for one man lift.
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
• Drain down the boiler only ,refer to relevant parts of
diagram 18.1.
• Disconnect the flue system.
9871
• Disconnect the fixing jig connection pipes at the boiler.
EXPANSION
VESSEL
• Disconnect the pressure relief valve discharge pipe.
• Disconnect the mains cable and any external controls cables.
• Lift up to remove the boiler from the wall.
• Remove sealed chamber cover, refer to Section 15.4.
• Remove the right hand side panel, refer to Section 15.6.
• From the rear of the boiler, unclip wiring harness retaining wire.
F24E shown
• Undo pipe coupling on expansion vessel.
Diagram 18.24
• Unscrew and remove expansion vessel bracket retaining screw.
• Slide expansion vessel to the left and forward to remove.
11436
FRONT
PANEL
Note: Check that expansion vessel pressure is correct, see
‘Section 1 Technical Data’.
18.36 Sealed chamber cover seal, refer to
diagram 18.25
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Remove the sealed chamber cover, refer to Section 15.5.
• Remove the old seal, thoroughly clean the casing. Fit the new
seal, it is supplied to the correct length.
Note: Ensure the seal is fitted correctly giving an air tight seal.
SEAL
SEALED
CHAMBER
COVER
Diagram 18.25
51
4000124050-2
19 Spare parts
When ordering spare parts, quote the part number and description, stating the appliance model number and serial number from
the data badge.
Short parts list
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Description
Central heating thermistor
Fan
Air pressure switch
F24E only Domestic water flow sensor
Printed circuit board - Main
Pump head
System water pressure sensor
Gas control valve (G20)
Gas control valve (G30)
Discharge safety valve
Overheat thermostat
Ignition electrode
Flame sense electrode
230V controls board
User interface PCB
Stepper motor (G20)
Stepper motor (G30)
Ignition unit
F24E only Three way valve head
Three way valve actuator
Heat exchanger
Burner
Part No.
S57398
S10088
S10089
S57202
S10082
S10052
S57205
S10045
S10046
S10067
S10080
S10038
S10037
S10091
S10081
S57434
S57435
S57427
S57206
S10064
S10030
S10042
G.C. No.
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Because of our constant endeavour for improvement details may vary slightly from those in the instructions.
4000124050-2
52
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